polygon slide
TRANSCRIPT
MATHEMATICS FORM 1POLYGON
SITI NORHASMIRA BINTI NORDIND20111048185
POLYGON
MATHEMATICS FORM 1
WHAT IS POLYGON???
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
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
Side
How many sides ???
512
4 0
Vertex
Vertices
Diagonal
Vertex
Vertices
Diagonal
Side
Type of polygon
I have 3 straight sides.I have 3 vertices.
What shape am I?
I’m a triangle!
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
I have 4 straight sides.I have 4 vertices.
What shape am I?
I’m a quadrilateral!
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.
QUADRILATERAL
I am a pentagon!
I have 5 straight sides.I have 5 vertices.
What shape am I?
PENTAGON
Regular Pentagon
Irregular Pentagon
Irregular Pentagon
Irregular Pentagon
I have 6 straight sides.I have 6 vertices.
What shape am I?I am a hexagon!
HEXAGON
Regular Hexagon Irregular Hexagon
Irregular Hexagon
I am anheptagon!
I have 7 straight sides.I have 7 vertices.
What shape am I?
HEPTAGON
Irregular Heptagon
Irregular Heptagon
Regular Heptagon
I have 8 straight sides.I have 8 vertices.
What shape am I?I am anoctagon!
OCTAGON
Irregular Octagon
Irregular Octagon
Regular Octagon
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)
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.
2. Name the polygon
A. Triangle
B. Quadriangle
C. Hexagon
D. Quadrilateral
3. Identify the polygon(s)
A B
CD
4. Which of the following are NOT polygons
A B
C D