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MATHEMATICS FORM 1POLYGON
SITI NORHASMIRA BINTI NORDIND20111048185
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POLYGON
MATHEMATICS FORM 1
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WHAT IS POLYGON???
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Polygon
Made of straight lines, and the shape
is “closed”
Bounded by three or more sides
Straight line sides meet at
point called a vertex
Line that joins two
non-adjacent
vertices of polygon is called a diagonal
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Which of following are polygon? Why?
POLYGON because have straight sides and enclosed
NOT A POLYGON because not enclosed figure
NOT A POLYGON because has a curve
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Side
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How many sides ???
512
4 0
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Vertex
Vertices
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Diagonal
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Vertex
Vertices
Diagonal
Side
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Type of polygon
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I have 3 straight sides.I have 3 vertices.
What shape am I?
I’m a triangle!
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TRIANGLE
Equilateral Triangle
Three equal sides Three equal angles,
always 60°
Isosceles Triangle
Two equal sides Two equal angles
Scalene Triangle
No equal sides No equal angles
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I have 4 straight sides.I have 4 vertices.
What shape am I?
I’m a quadrilateral!
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QUADRILATERAL
Quadrilateral just means "four sides" (quad means four, lateral means side).
Any four-sided shape is a Quadrilateral.
But the sides have to be straight, and it has to be 2-dimensional.
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QUADRILATERAL
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I am a pentagon!
I have 5 straight sides.I have 5 vertices.
What shape am I?
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PENTAGON
Regular Pentagon
Irregular Pentagon
Irregular Pentagon
Irregular Pentagon
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I have 6 straight sides.I have 6 vertices.
What shape am I?I am a hexagon!
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HEXAGON
Regular Hexagon Irregular Hexagon
Irregular Hexagon
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I am anheptagon!
I have 7 straight sides.I have 7 vertices.
What shape am I?
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HEPTAGON
Irregular Heptagon
Irregular Heptagon
Regular Heptagon
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I have 8 straight sides.I have 8 vertices.
What shape am I?I am anoctagon!
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OCTAGON
Irregular Octagon
Irregular Octagon
Regular Octagon
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Symmetry
• An object is said to have line(s) of symmetry if one side of it overlaps exactly with the other.
Line of symmetry(diagonal)
Line of symmetry(vertical)
Line of symmetry(horizontal)
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EXERCISE
1. Which of the following is a correct definition of a polygon?
A . A closed plane figure with 3 or more straight edges as its sides.
B. A figure with 3 or more straight edges.
C. A closed figure with either straight or curved edges as its sides.
D. A plain figure with 3 or more straight edges as its sides.
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2. Name the polygon
A. Triangle
B. Quadriangle
C. Hexagon
D. Quadrilateral
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3. Identify the polygon(s)
A B
CD
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4. Which of the following are NOT polygons
A B
C D