Question 1

After a dilation, a figure and its image are said to be...

Accepted Answer

Similar

Answer

Perpendicular

Answer

Congruent

Answer

Enlarged

Question 2

Which of the following is NOT true about dilations?

Accepted Answer

Corresponding angles in dilated figures are proportional.

Answer

Corresponding sides in dilated figures are parallel.

Answer

Corresponding sides in dilated figures are proportional.

Answer

Corresponding angles in dilated figures are congruent.

Question 3

The triangles are similar to one another (aka a scale factor was applied to the sides of one triangle to create the other triangle). What is the value of x?

Accepted Answer

5

Answer

11

Answer

8

Answer

80

Question 4

The rectangles are similar to one another. What is the value of the missing side length?

Accepted Answer

16

Answer

19

Answer

8

Answer

4

Question 5

Are the triangles similar to one another?  How can you tell?

Accepted Answer

Yes, because 84/14 = 72/12 = 48/8 = 6. In other words, the sides have a ratio of 1:6.

Answer

No, because when you find the difference between the corresponding sides, they are not equal. 84 - 14 does not equal 72 - 12.

Answer

Yes, because the zoom factor is 6 and 6 is a whole number.

Answer

There is not enough information to tell, because there are no angles marked up.

Question 6

A figure that contains the point ( 7 , -2 ) is dilated by a factor of 1/2 about the origin of the graph. What is the image of this point?

Accepted Answer

( 3.5 , -1 )

Answer

( 0 , 0 )

Answer

( 14 , -4 )

Answer

( 6.5 , -2.5 )

Question 7

Which combination of transformations could map PQR onto P'Q'R'?

Accepted Answer

A translation 5 units to the right, then a dilation about P by a factor of 3.

Answer

A 180 degree rotation about Q, then a dilation about R by a factor of 3.

Answer

A translation 4 units up, then a dilation about R by a factor of 3.

Answer

A reflection over PQ, then a dilation about P by a factor of 3.

Question 8

Which of the following is an example of a dilation in the real world?

Accepted Answer

A picture of your house

Answer

Going down a slide

Answer

Doing a cartwheel

Answer

Looking in a mirror

Question 9

A ( 6 , -1 ) was dilated about the origin to create A' (15, -2.5 ). What scale factor was applied?

Accepted Answer

2.5

Answer

6

Answer

0.4

Answer

9

Question 10

Which of the following proportions is true for these similar triangles?

Accepted Answer

3/4 = 9/12

Answer

12/4 = 9/5

Answer

5/15 = 4/3

Answer

9/15 = 5/3

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