Similar Polygons

Some types of polygons

A polygon is a shape that has any number of straight sides connected at vertices(corners).

A triangle is a 3 sided polygon.

A square is a 4 sided polygon.

Two polygons have equal corresponding angles

and

The corresponding sides are proportional

We have already studied a special case of similar polygons

Similar triangles

Polygons are similar when...

63

2 1

Are these similar polygons???

A B C

10

8

6

5

5

4

Which of the following are similar polygons??

950

1600

1150

700

1000

H

I

K

L

JName all of the corresponding angles

Set up proportions of all corresponding sides

950

1600

1150

700

1000

A

B

C

D

E

950

1600

1150

700

1000

A

B

C

D

E

950

1600

1150

700

1000

H

I

K

L

J

Find the missing side HL

1.5

32.5

1.6

2.2

4.5

2.25

2.4

3.75

95 0

160 0

115 070 0

100 0

AB

CD

E

10.75

2.7

950

1600

1150

700

1000

H

I

K

L

J

2.25

4

2.4

Find the missing sides HL, JK, BC, DE

Read Pages 154-156

Do questions 2,3,5,6,10,12pages 157-158