Similar Sides and Proportions

In order for two polygons to be similar, what must be true about the sides and angles?

• All sides and angles are congruent

• All sides and angles are proportional

• Sides are congruent, Angles are proportional

• Sides and proportional, Angles are congruent

Rectangle ABCD and rectangle DEFG are similar figures. Which of the following proportions is true for the figures?

The pair of figures is similar. Find the missing side length.

• x = 10

• x = 4

• x = 2

• x = 5

Find missing side length of the similar triangles

• 5

• 7

• 9

• 11

What is the scale factor if the triangle on the left is the original?

• 2

• 3/2

• 2/3

• 1/2

State if the triangles in each pair are similar. If so, state how you know they are similar.

• Yes, AA Similarity

• Yes, SSS Similarity

• Yes, SAS Similarity

• Not Similar

Which proportion is true?

Which proportion is true?

Line CB corresponds with what line? 

• SR

• PQ

• SP

• RQ

Tell whether the two figures are similar. Explain your reasoning.

• Yes, similar because they have the same shape and the same angles

• No, the ratio of corresponding sides are not equal 

• Yes, same shape

• No, different sizes