int math 2 section 5-7 1011
DESCRIPTION
Diagonals and Angles of PolygonsTRANSCRIPT
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Section 5-7Diagonals and Angles of Polygons
Wed, Feb 02
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Essential Questions
✤ How are polygons classified according to their sides?
✤ How do you find the sum of the angle measures of polygons?
✤ Where you’ll see this:
✤ Safety, hobbies, nature
Wed, Feb 02
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Vocabulary
1. Polygon:
2. Side:
3. Vertex:
4. Convex:
5. Concave:
6. Regular Polygon:
7. Diagonal:
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Vocabulary
1. Polygon: A closed figure made by joining three or more segments at their endpoints
2. Side:
3. Vertex:
4. Convex:
5. Concave:
6. Regular Polygon:
7. Diagonal:
Wed, Feb 02
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Vocabulary
1. Polygon: A closed figure made by joining three or more segments at their endpoints
2. Side: One of the segments that makes up the polygon
3. Vertex:
4. Convex:
5. Concave:
6. Regular Polygon:
7. Diagonal:
Wed, Feb 02
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Vocabulary
1. Polygon: A closed figure made by joining three or more segments at their endpoints
2. Side: One of the segments that makes up the polygon
3. Vertex: The point where segments meet
4. Convex:
5. Concave:
6. Regular Polygon:
7. Diagonal:
Wed, Feb 02
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Vocabulary
1. Polygon: A closed figure made by joining three or more segments at their endpoints
2. Side: One of the segments that makes up the polygon
3. Vertex: The point where segments meet
4. Convex: When there are no indentations in a polygon
5. Concave:
6. Regular Polygon:
7. Diagonal:
Wed, Feb 02
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Vocabulary
1. Polygon: A closed figure made by joining three or more segments at their endpoints
2. Side: One of the segments that makes up the polygon
3. Vertex: The point where segments meet
4. Convex: When there are no indentations in a polygon
5. Concave: When there is an indentation into a polygon
6. Regular Polygon:
7. Diagonal:
Wed, Feb 02
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Vocabulary
1. Polygon: A closed figure made by joining three or more segments at their endpoints
2. Side: One of the segments that makes up the polygon
3. Vertex: The point where segments meet
4. Convex: When there are no indentations in a polygon
5. Concave: When there is an indentation into a polygon
6. Regular Polygon: A polygon where all the sides and angles are congruent
7. Diagonal:
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Vocabulary
1. Polygon: A closed figure made by joining three or more segments at their endpoints
2. Side: One of the segments that makes up the polygon
3. Vertex: The point where segments meet
4. Convex: When there are no indentations in a polygon
5. Concave: When there is an indentation into a polygon
6. Regular Polygon: A polygon where all the sides and angles are congruent
7. Diagonal: A segment that joins two vertices but is not a side
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Polygons and Their Sides
5 sides: 6 sides: 7 sides:
9 sides:8 sides: 10 sides:
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Polygons and Their Sides
5 sides: 6 sides: 7 sides:
9 sides:8 sides: 10 sides:
Pentagon
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Polygons and Their Sides
5 sides: 6 sides: 7 sides:
9 sides:8 sides: 10 sides:
Pentagon
Wed, Feb 02
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Polygons and Their Sides
5 sides: 6 sides: 7 sides:
9 sides:8 sides: 10 sides:
Pentagon Hexagon
Wed, Feb 02
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Polygons and Their Sides
5 sides: 6 sides: 7 sides:
9 sides:8 sides: 10 sides:
Pentagon Hexagon
Wed, Feb 02
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Polygons and Their Sides
5 sides: 6 sides: 7 sides:
9 sides:8 sides: 10 sides:
Pentagon Hexagon Heptagon
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Polygons and Their Sides
5 sides: 6 sides: 7 sides:
9 sides:8 sides: 10 sides:
Pentagon Hexagon Heptagon
Wed, Feb 02
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Polygons and Their Sides
5 sides: 6 sides: 7 sides:
9 sides:8 sides: 10 sides:
Pentagon Hexagon Heptagon
Octagon
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Polygons and Their Sides
5 sides: 6 sides: 7 sides:
9 sides:8 sides: 10 sides:
Pentagon Hexagon Heptagon
Octagon
Wed, Feb 02
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Polygons and Their Sides
5 sides: 6 sides: 7 sides:
9 sides:8 sides: 10 sides:
Pentagon Hexagon Heptagon
Octagon Nonagon
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Polygons and Their Sides
5 sides: 6 sides: 7 sides:
9 sides:8 sides: 10 sides:
Pentagon Hexagon Heptagon
Octagon Nonagon
Wed, Feb 02
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Polygons and Their Sides
5 sides: 6 sides: 7 sides:
9 sides:8 sides: 10 sides:
Pentagon Hexagon Heptagon
Octagon Nonagon Decagon
Wed, Feb 02
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Polygons and Their Sides
5 sides: 6 sides: 7 sides:
9 sides:8 sides: 10 sides:
Pentagon Hexagon Heptagon
Octagon Nonagon Decagon
Wed, Feb 02
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Polygons and Their Sides
5 sides: 6 sides: 7 sides:
9 sides:8 sides: 10 sides:
Pentagon Hexagon Heptagon
Octagon Nonagon Decagon
Anything larger:Wed, Feb 02
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Polygons and Their Sides
5 sides: 6 sides: 7 sides:
9 sides:8 sides: 10 sides:
Pentagon Hexagon Heptagon
Octagon Nonagon Decagon
Anything larger: n-gon, where n is the number of sidesWed, Feb 02
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Example 1
Name each polygon by its number of sides and label as concave or convex.
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Example 1
Name each polygon by its number of sides and label as concave or convex.
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Example 1
Name each polygon by its number of sides and label as concave or convex.
Concave
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Example 1
Name each polygon by its number of sides and label as concave or convex.
ConcavePentagon
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Example 1
Name each polygon by its number of sides and label as concave or convex.
ConcavePentagon
Convex
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Example 1
Name each polygon by its number of sides and label as concave or convex.
ConcavePentagon
ConvexOctagon
Wed, Feb 02
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Example 1
Name each polygon by its number of sides and label as concave or convex.
ConcavePentagon
ConvexOctagon
Convex
Wed, Feb 02
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Example 1
Name each polygon by its number of sides and label as concave or convex.
ConcavePentagon
ConvexOctagon
ConvexQuadrilateral
Wed, Feb 02
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Example 1
Name each polygon by its number of sides and label as concave or convex.
ConcavePentagon
ConvexOctagon
ConvexQuadrilateral
Concave
Wed, Feb 02
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Example 1
Name each polygon by its number of sides and label as concave or convex.
ConcavePentagon
ConvexOctagon
ConvexQuadrilateral
ConcaveNonagon
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# of sides:
# of triangles:
Degrees:
# of sides:
# of triangles:
Degrees:
# of sides:
# of triangles:
Degrees:
# of sides:
# of triangles:
Degrees:
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# of sides:
# of triangles:
Degrees:
3 # of sides:
# of triangles:
Degrees:
# of sides:
# of triangles:
Degrees:
# of sides:
# of triangles:
Degrees:
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# of sides:
# of triangles:
Degrees:
3
1
# of sides:
# of triangles:
Degrees:
# of sides:
# of triangles:
Degrees:
# of sides:
# of triangles:
Degrees:
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# of sides:
# of triangles:
Degrees:
3
1
180°
# of sides:
# of triangles:
Degrees:
# of sides:
# of triangles:
Degrees:
# of sides:
# of triangles:
Degrees:
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# of sides:
# of triangles:
Degrees:
3
1
180°
# of sides:
# of triangles:
Degrees:
4
# of sides:
# of triangles:
Degrees:
# of sides:
# of triangles:
Degrees:
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# of sides:
# of triangles:
Degrees:
3
1
180°
# of sides:
# of triangles:
Degrees:
4
# of sides:
# of triangles:
Degrees:
# of sides:
# of triangles:
Degrees:
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# of sides:
# of triangles:
Degrees:
3
1
180°
# of sides:
# of triangles:
Degrees:
4
2
# of sides:
# of triangles:
Degrees:
# of sides:
# of triangles:
Degrees:
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# of sides:
# of triangles:
Degrees:
3
1
180°
# of sides:
# of triangles:
Degrees:
4
2
360°
# of sides:
# of triangles:
Degrees:
# of sides:
# of triangles:
Degrees:
Wed, Feb 02
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# of sides:
# of triangles:
Degrees:
3
1
180°
# of sides:
# of triangles:
Degrees:
4
2
360°
# of sides:
# of triangles:
Degrees:
5 # of sides:
# of triangles:
Degrees:
Wed, Feb 02
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# of sides:
# of triangles:
Degrees:
3
1
180°
# of sides:
# of triangles:
Degrees:
4
2
360°
# of sides:
# of triangles:
Degrees:
5 # of sides:
# of triangles:
Degrees:
Wed, Feb 02
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# of sides:
# of triangles:
Degrees:
3
1
180°
# of sides:
# of triangles:
Degrees:
4
2
360°
# of sides:
# of triangles:
Degrees:
5 # of sides:
# of triangles:
Degrees:
Wed, Feb 02
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# of sides:
# of triangles:
Degrees:
3
1
180°
# of sides:
# of triangles:
Degrees:
4
2
360°
# of sides:
# of triangles:
Degrees:
5
3
# of sides:
# of triangles:
Degrees:
Wed, Feb 02
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# of sides:
# of triangles:
Degrees:
3
1
180°
# of sides:
# of triangles:
Degrees:
4
2
360°
# of sides:
# of triangles:
Degrees:
5
3
540°
# of sides:
# of triangles:
Degrees:
Wed, Feb 02
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# of sides:
# of triangles:
Degrees:
3
1
180°
# of sides:
# of triangles:
Degrees:
4
2
360°
# of sides:
# of triangles:
Degrees:
5
3
540°
# of sides:
# of triangles:
Degrees:
6
Wed, Feb 02
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# of sides:
# of triangles:
Degrees:
3
1
180°
# of sides:
# of triangles:
Degrees:
4
2
360°
# of sides:
# of triangles:
Degrees:
5
3
540°
# of sides:
# of triangles:
Degrees:
6
Wed, Feb 02
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# of sides:
# of triangles:
Degrees:
3
1
180°
# of sides:
# of triangles:
Degrees:
4
2
360°
# of sides:
# of triangles:
Degrees:
5
3
540°
# of sides:
# of triangles:
Degrees:
6
Wed, Feb 02
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# of sides:
# of triangles:
Degrees:
3
1
180°
# of sides:
# of triangles:
Degrees:
4
2
360°
# of sides:
# of triangles:
Degrees:
5
3
540°
# of sides:
# of triangles:
Degrees:
6
Wed, Feb 02
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# of sides:
# of triangles:
Degrees:
3
1
180°
# of sides:
# of triangles:
Degrees:
4
2
360°
# of sides:
# of triangles:
Degrees:
5
3
540°
# of sides:
# of triangles:
Degrees:
6
4
Wed, Feb 02
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# of sides:
# of triangles:
Degrees:
3
1
180°
# of sides:
# of triangles:
Degrees:
4
2
360°
# of sides:
# of triangles:
Degrees:
5
3
540°
# of sides:
# of triangles:
Degrees:
6
4
720°
Wed, Feb 02
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Angle Sum of a Polygon:
Angle Measure of a Regular Polygon:
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Angle Sum of a Polygon: The sum of the interior angles of a polygon with n sides is given by the formula
Angle Measure of a Regular Polygon:
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Angle Sum of a Polygon: The sum of the interior angles of a polygon with n sides is given by the formula
Angle Measure of a Regular Polygon: The measure of each interior angle of a regular polygon with n sides is given by the formula
S = (n − 2)180°n
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Example 2
In hexagon ABCDEF, m∠A = m∠B = 10x, m∠C = m∠D = 3x + 8, m∠E = 7x - 22, and m∠F = 8x - 12. Find the sum of the measures of
the angles of the hexagon, then find the measure of each angle.
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Example 2
In hexagon ABCDEF, m∠A = m∠B = 10x, m∠C = m∠D = 3x + 8, m∠E = 7x - 22, and m∠F = 8x - 12. Find the sum of the measures of
the angles of the hexagon, then find the measure of each angle.A
B
C
D
E
F
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Example 2
In hexagon ABCDEF, m∠A = m∠B = 10x, m∠C = m∠D = 3x + 8, m∠E = 7x - 22, and m∠F = 8x - 12. Find the sum of the measures of
the angles of the hexagon, then find the measure of each angle.A
B
C
D
E
F
10x
10x
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Example 2
In hexagon ABCDEF, m∠A = m∠B = 10x, m∠C = m∠D = 3x + 8, m∠E = 7x - 22, and m∠F = 8x - 12. Find the sum of the measures of
the angles of the hexagon, then find the measure of each angle.A
B
C
D
E
F
10x
10x
3x + 8
3x + 8
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Example 2
In hexagon ABCDEF, m∠A = m∠B = 10x, m∠C = m∠D = 3x + 8, m∠E = 7x - 22, and m∠F = 8x - 12. Find the sum of the measures of
the angles of the hexagon, then find the measure of each angle.A
B
C
D
E
F
10x
10x
3x + 8
3x + 8
7x - 22
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Example 2
In hexagon ABCDEF, m∠A = m∠B = 10x, m∠C = m∠D = 3x + 8, m∠E = 7x - 22, and m∠F = 8x - 12. Find the sum of the measures of
the angles of the hexagon, then find the measure of each angle.A
B
C
D
E
F
10x
10x
3x + 8
3x + 8
7x - 22
8x - 12
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Example 2
In hexagon ABCDEF, m∠A = m∠B = 10x, m∠C = m∠D = 3x + 8, m∠E = 7x - 22, and m∠F = 8x - 12. Find the sum of the measures of
the angles of the hexagon, then find the measure of each angle.A
B
C
D
E
F
10x
10x
3x + 8
3x + 8
7x - 22
8x - 12S = (n − 2)180°
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Example 2
In hexagon ABCDEF, m∠A = m∠B = 10x, m∠C = m∠D = 3x + 8, m∠E = 7x - 22, and m∠F = 8x - 12. Find the sum of the measures of
the angles of the hexagon, then find the measure of each angle.A
B
C
D
E
F
10x
10x
3x + 8
3x + 8
7x - 22
8x - 12S = (n − 2)180°S = (6 − 2)180°
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Example 2
In hexagon ABCDEF, m∠A = m∠B = 10x, m∠C = m∠D = 3x + 8, m∠E = 7x - 22, and m∠F = 8x - 12. Find the sum of the measures of
the angles of the hexagon, then find the measure of each angle.A
B
C
D
E
F
10x
10x
3x + 8
3x + 8
7x - 22
8x - 12
S = (4)180°
S = (n − 2)180°S = (6 − 2)180°
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Example 2
In hexagon ABCDEF, m∠A = m∠B = 10x, m∠C = m∠D = 3x + 8, m∠E = 7x - 22, and m∠F = 8x - 12. Find the sum of the measures of
the angles of the hexagon, then find the measure of each angle.A
B
C
D
E
F
10x
10x
3x + 8
3x + 8
7x - 22
8x - 12
S = (4)180°
S = (n − 2)180°S = (6 − 2)180°
S = 720°
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Example 2
In hexagon ABCDEF, m∠A = m∠B = 10x, m∠C = m∠D = 3x + 8, m∠E = 7x - 22, and m∠F = 8x - 12. Find the sum of the measures of
the angles of the hexagon, then find the measure of each angle.A
B
C
D
E
F
10x
10x
3x + 8
3x + 8
7x - 22
8x - 12
S = (4)180°
S = (n − 2)180°S = (6 − 2)180°
S = 720°The sum of all of the angles is 720°
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Example 2
In hexagon ABCDEF, m∠A = m∠B = 10x, m∠C = m∠D = 3x + 8, m∠E = 7x - 22, and m∠F = 8x - 12. Find the sum of the measures of
the angles of the hexagon, then find the measure of each angle.A
B
C
D
E
F
10x
10x
3x + 8
3x + 8
7x - 22
8x - 12
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Example 2
In hexagon ABCDEF, m∠A = m∠B = 10x, m∠C = m∠D = 3x + 8, m∠E = 7x - 22, and m∠F = 8x - 12. Find the sum of the measures of
the angles of the hexagon, then find the measure of each angle.A
B
C
D
E
F
10x
10x
3x + 8
3x + 8
7x - 22
8x - 12
2(10x) + 2(3x + 8) + 7x − 22 + 8x −12 = 720°
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Example 2
In hexagon ABCDEF, m∠A = m∠B = 10x, m∠C = m∠D = 3x + 8, m∠E = 7x - 22, and m∠F = 8x - 12. Find the sum of the measures of
the angles of the hexagon, then find the measure of each angle.A
B
C
D
E
F
10x
10x
3x + 8
3x + 8
7x - 22
8x - 12
2(10x) + 2(3x + 8) + 7x − 22 + 8x −12 = 720°20x + 6x +16 + 7x − 22 + 8x −12 = 720°
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Example 2
In hexagon ABCDEF, m∠A = m∠B = 10x, m∠C = m∠D = 3x + 8, m∠E = 7x - 22, and m∠F = 8x - 12. Find the sum of the measures of
the angles of the hexagon, then find the measure of each angle.A
B
C
D
E
F
10x
10x
3x + 8
3x + 8
7x - 22
8x - 12
2(10x) + 2(3x + 8) + 7x − 22 + 8x −12 = 720°20x + 6x +16 + 7x − 22 + 8x −12 = 720°
41x −18 = 720°
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Example 2
In hexagon ABCDEF, m∠A = m∠B = 10x, m∠C = m∠D = 3x + 8, m∠E = 7x - 22, and m∠F = 8x - 12. Find the sum of the measures of
the angles of the hexagon, then find the measure of each angle.A
B
C
D
E
F
10x
10x
3x + 8
3x + 8
7x - 22
8x - 12
2(10x) + 2(3x + 8) + 7x − 22 + 8x −12 = 720°20x + 6x +16 + 7x − 22 + 8x −12 = 720°
41x −18 = 720°+18 +18
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Example 2
In hexagon ABCDEF, m∠A = m∠B = 10x, m∠C = m∠D = 3x + 8, m∠E = 7x - 22, and m∠F = 8x - 12. Find the sum of the measures of
the angles of the hexagon, then find the measure of each angle.A
B
C
D
E
F
10x
10x
3x + 8
3x + 8
7x - 22
8x - 12
2(10x) + 2(3x + 8) + 7x − 22 + 8x −12 = 720°20x + 6x +16 + 7x − 22 + 8x −12 = 720°
41x −18 = 720°+18 +1841x = 738
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Example 2
In hexagon ABCDEF, m∠A = m∠B = 10x, m∠C = m∠D = 3x + 8, m∠E = 7x - 22, and m∠F = 8x - 12. Find the sum of the measures of
the angles of the hexagon, then find the measure of each angle.A
B
C
D
E
F
10x
10x
3x + 8
3x + 8
7x - 22
8x - 12
2(10x) + 2(3x + 8) + 7x − 22 + 8x −12 = 720°20x + 6x +16 + 7x − 22 + 8x −12 = 720°
41x −18 = 720°+18 +1841x = 73841 41
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Example 2
In hexagon ABCDEF, m∠A = m∠B = 10x, m∠C = m∠D = 3x + 8, m∠E = 7x - 22, and m∠F = 8x - 12. Find the sum of the measures of
the angles of the hexagon, then find the measure of each angle.A
B
C
D
E
F
10x
10x
3x + 8
3x + 8
7x - 22
8x - 12
2(10x) + 2(3x + 8) + 7x − 22 + 8x −12 = 720°20x + 6x +16 + 7x − 22 + 8x −12 = 720°
41x −18 = 720°+18 +1841x = 73841 41x = 18
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Example 2
In hexagon ABCDEF, m∠A = m∠B = 10x, m∠C = m∠D = 3x + 8, m∠E = 7x - 22, and m∠F = 8x - 12. Find the sum of the measures of
the angles of the hexagon, then find the measure of each angle.A
B
C
D
E
F
10x
10x
3x + 8
3x + 8
7x - 22
8x - 12
x = 18
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Example 2
In hexagon ABCDEF, m∠A = m∠B = 10x, m∠C = m∠D = 3x + 8, m∠E = 7x - 22, and m∠F = 8x - 12. Find the sum of the measures of
the angles of the hexagon, then find the measure of each angle.A
B
C
D
E
F
10x
10x
3x + 8
3x + 8
7x - 22
8x - 12
x = 18
10(18) =
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Example 2
In hexagon ABCDEF, m∠A = m∠B = 10x, m∠C = m∠D = 3x + 8, m∠E = 7x - 22, and m∠F = 8x - 12. Find the sum of the measures of
the angles of the hexagon, then find the measure of each angle.A
B
C
D
E
F
10x
10x
3x + 8
3x + 8
7x - 22
8x - 12
x = 18
10(18) = 180°
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Example 2
In hexagon ABCDEF, m∠A = m∠B = 10x, m∠C = m∠D = 3x + 8, m∠E = 7x - 22, and m∠F = 8x - 12. Find the sum of the measures of
the angles of the hexagon, then find the measure of each angle.A
B
C
D
E
F
10x
10x
3x + 8
3x + 8
7x - 22
8x - 12
x = 18
10(18) = 180° = m∠A = m∠B
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Example 2
In hexagon ABCDEF, m∠A = m∠B = 10x, m∠C = m∠D = 3x + 8, m∠E = 7x - 22, and m∠F = 8x - 12. Find the sum of the measures of
the angles of the hexagon, then find the measure of each angle.A
B
C
D
E
F
10x
10x
3x + 8
3x + 8
7x - 22
8x - 12
x = 18
10(18) =
3(18) + 8 =
180° = m∠A = m∠B
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Example 2
In hexagon ABCDEF, m∠A = m∠B = 10x, m∠C = m∠D = 3x + 8, m∠E = 7x - 22, and m∠F = 8x - 12. Find the sum of the measures of
the angles of the hexagon, then find the measure of each angle.A
B
C
D
E
F
10x
10x
3x + 8
3x + 8
7x - 22
8x - 12
x = 18
10(18) =
3(18) + 8 =
180°
62°
= m∠A = m∠B
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Example 2
In hexagon ABCDEF, m∠A = m∠B = 10x, m∠C = m∠D = 3x + 8, m∠E = 7x - 22, and m∠F = 8x - 12. Find the sum of the measures of
the angles of the hexagon, then find the measure of each angle.A
B
C
D
E
F
10x
10x
3x + 8
3x + 8
7x - 22
8x - 12
x = 18
10(18) =
3(18) + 8 =
180°
62°
= m∠A = m∠B
= m∠C = m∠D
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Example 2
In hexagon ABCDEF, m∠A = m∠B = 10x, m∠C = m∠D = 3x + 8, m∠E = 7x - 22, and m∠F = 8x - 12. Find the sum of the measures of
the angles of the hexagon, then find the measure of each angle.A
B
C
D
E
F
10x
10x
3x + 8
3x + 8
7x - 22
8x - 12
x = 18
10(18) =
3(18) + 8 =
180°
62°
7(18) - 22 =
= m∠A = m∠B
= m∠C = m∠D
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Example 2
In hexagon ABCDEF, m∠A = m∠B = 10x, m∠C = m∠D = 3x + 8, m∠E = 7x - 22, and m∠F = 8x - 12. Find the sum of the measures of
the angles of the hexagon, then find the measure of each angle.A
B
C
D
E
F
10x
10x
3x + 8
3x + 8
7x - 22
8x - 12
x = 18
10(18) =
3(18) + 8 =
180°
62°
7(18) - 22 = 104°
= m∠A = m∠B
= m∠C = m∠D
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Example 2
In hexagon ABCDEF, m∠A = m∠B = 10x, m∠C = m∠D = 3x + 8, m∠E = 7x - 22, and m∠F = 8x - 12. Find the sum of the measures of
the angles of the hexagon, then find the measure of each angle.A
B
C
D
E
F
10x
10x
3x + 8
3x + 8
7x - 22
8x - 12
x = 18
10(18) =
3(18) + 8 =
180°
62°
7(18) - 22 = 104°
= m∠A = m∠B
= m∠C = m∠D
= m∠E
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Example 2
In hexagon ABCDEF, m∠A = m∠B = 10x, m∠C = m∠D = 3x + 8, m∠E = 7x - 22, and m∠F = 8x - 12. Find the sum of the measures of
the angles of the hexagon, then find the measure of each angle.A
B
C
D
E
F
10x
10x
3x + 8
3x + 8
7x - 22
8x - 12
x = 18
10(18) =
3(18) + 8 =
180°
62°
7(18) - 22 = 104°
8(18) - 12 =
= m∠A = m∠B
= m∠C = m∠D
= m∠E
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Example 2
In hexagon ABCDEF, m∠A = m∠B = 10x, m∠C = m∠D = 3x + 8, m∠E = 7x - 22, and m∠F = 8x - 12. Find the sum of the measures of
the angles of the hexagon, then find the measure of each angle.A
B
C
D
E
F
10x
10x
3x + 8
3x + 8
7x - 22
8x - 12
x = 18
10(18) =
3(18) + 8 =
180°
62°
7(18) - 22 = 104°
8(18) - 12 = 132°
= m∠A = m∠B
= m∠C = m∠D
= m∠E
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Example 2
In hexagon ABCDEF, m∠A = m∠B = 10x, m∠C = m∠D = 3x + 8, m∠E = 7x - 22, and m∠F = 8x - 12. Find the sum of the measures of
the angles of the hexagon, then find the measure of each angle.A
B
C
D
E
F
10x
10x
3x + 8
3x + 8
7x - 22
8x - 12
x = 18
10(18) =
3(18) + 8 =
180°
62°
7(18) - 22 = 104°
8(18) - 12 = 132°
= m∠A = m∠B
= m∠C = m∠D
= m∠E
= m∠F
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Example 3
Find the measure of each angle of a regular 14-gon.
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Example 3
Find the measure of each angle of a regular 14-gon.
S = (n − 2)180°n
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Example 3
Find the measure of each angle of a regular 14-gon.
S = (n − 2)180°n
S = (14 − 2)180°14
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Example 3
Find the measure of each angle of a regular 14-gon.
S = (n − 2)180°n
S = (14 − 2)180°14
S = (12)180°14
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Example 3
Find the measure of each angle of a regular 14-gon.
S = (n − 2)180°n
S = (14 − 2)180°14
S = (12)180°14
S = 2160°14
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Example 3
Find the measure of each angle of a regular 14-gon.
S = (n − 2)180°n
S = (14 − 2)180°14
S = (12)180°14
S = 2160°14
S = 154 2 7°
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Problem Set
Wed, Feb 02
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Problem Set
p. 224 #1-33 odd
“Liberty without learning is always in peril; learning without liberty is always in vain.” - John F. Kennedy
Wed, Feb 02