Geometry Unit 5 Review

Which is the best definition of similarity?

• If two figures have congruent corresponding angles, they are similar.

• If two figures have proportional side lengths, they are similar.

• If there's a sequence of rigid transformations that take one figure to another, they are similar.

• If there's a sequence of rigid transformations and dilations that take one figure to another, they are similar.

Determine the scale factor from the left figure to the right figure.

• 4/3

• 3/4

• 2/3

• 3/2

What is the scale factor from triangle ADE to triangle ACB?

• 2

• 3

• 4/3

• 5/3

Which pair of polygons is definitely similar?

• 
• 
• 
• 

What is the value of a?

• 1.25

• 1.5

• 1.875

• 2

Triangle DEF is formed by connecting the midpoints of the sides of triangle ABC. The lengths of the sides of DEF are shown. What is the length of BC?

• 8

• 12

• 15

• 18

• 40 degrees

• 60 degrees

• 65 degrees

• 75 degrees

Right angle ABC is taken by a dilation with center P and scale factor 1/3 to angle A'B'C'. What is the measure of angle A'B'C'?

• 90 degrees

• 60 degrees

• 30 degrees

• 180 degrees

A polygon has perimeter 24. It is dilated with a scale factor of k and the resulting image has a perimeter of 18. What is the scale factor?

• 4/3

• 3/4

• 2/3

• 3/2

If the perimeter of triangle MNL is 24 units, what is the perimeter of triangle CBA?