Dilations & Triangle Similarity

What is Dilation?

• Dilation means to enlarge or reduce a shape

• Dilation means to flip over a line

• Dilation means two figures that look alike

• Dilation means to make a shape smaller

If two figures are similar, the corresponding sides are ______________.

• equal

• congruent

• proportional

• none of these

What happens to a figure when it is dilated by a scale factor of a fraction less than 1?

• it becomes smaller

• it becomes larger

• it stays the same

Which of the following rules represents a dilation?

• (x, y) → (x, 3y)

• (x, y) → (3x, 3y)

• (x, y) → (x - 4, y - 3)

• (x, y) → (.5x, .4y)

Similar figures have the same ______ but different ______. 

• measure; shapes

• sizes; shapes

• value; measures

• shape; sizes

What angle is corresponding to angle D?

• A

• B

• C

• F

Given that the two triangles are similar, which side is corresponding to PQ?

• EF

• DE

• DF

• FE

The figure is dilated around the origin. Choose the correct scale factor:

• 2

• 3

• 1/3

• 1/2

The figure is dilated around the origin. Choose the correct scale factor:

• 2.5

• 1.5

• 3.5

• 4

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

• ½

• ¼

• 4

• 2