7.2 - Similar Polygons

7.2 - Similar Polygons

By Steve Dull

Objective

​To identify and apply similar polygons.

Essential Understanding

You can use ratios and proportions to decide whether two polygons are similar and to find unknown side lengths of similar figures.

Vocabulary

Similar Figures

have the same shape but not necessarily the same size.

​

Abbreviate is similar ​to using the ∼ symbol.

Some text here about the topic of discussion

Similar Polygons

Two more things:

• The ratio of corresponding sides is called the scale factor.

• If polygons are similar then their perimeters are also proportional.​

Multiple Choice

What is the scale factor of $$\Delta ABC$$  to $$\Delta DEF$$  ?

• 3:2

• 6:5

• 2:3

• 5:4

Open Ended

What is the length LY?

Poll

How we feeling on similarity?

• Pretty much lost

• It kinda makes sense

• I think I get it, maybe a little more practice and I'm good

• Take a long lunch Mister, I'm gonna teach your next class