Similarity Geometry

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

The following triangles are similar.
AC ∼

•  DF

• AB 

•  ED

•  FC

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

Triangle ABC and triangle WXY are similar figures. Which of the following proportions is true for the figures?

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

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

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

All angles in similar figures are congruent (equal).

• True

• False