Dilations Similarity

Under a dilation, which scale factor will result in a congruent image?

• -2

• 0

• 1

• ¹/₂

All angles in similar figures are congruent.  

• True

• False

The measures of the angles in a triangle are 53⁰,78⁰, and 49⁰.  A similar triangle is created by using a dilation with a scale factor of 2.  What are the measures of the angles of this triangle?

• 53⁰,78⁰, and 49⁰

• There is not enough information to answer this question.

• 106⁰,156⁰, and 98⁰

• 26.5⁰,39⁰, and 24.5⁰

Are the two figures similar

• yes

• no

Are the two figures similar?

• Yes

• No

Are the triangles similar?

• Yes

• No

Find missing side.

• 1/5

• 5

• 7

• 1/7

What is the algebraic rule for the dilated image?

• ( x , y ) --> ( 3x, 3y )

• ( 3x, 3y ) --> ( x , y )

• (x , y) --> (0.3x , 0.3y)

• ( x , y ) --> ( 2x, 2y )

Choose the correct scale factor:

• 2

• 3

• 1/3

• 1/2

The point (8, 12) was dilated to become point (2, 3). What was the scale factor?

• ½

• ¼

• 4

• 2