GEO: Ch. 7 Test Review

Dilate the figure by a scale factor of 3 with the origin as the center of dilation. What are the coordinates of the image?
A(3,3) B(6,6) C(9,3)

• A'(9,9) B'(18,18) C'(27,9)
• A'(6,6) B'(9,9) C'(12,6)
• A'(0,0) B'(3,3) C'(6,0)
• A'(1,1) B'(2,2) C'(3,1)

A triangle has vertices with coordinates (2,0), (3, -1) and (-2,-5). If the triangle is dilated by a scale factor of -3 with the origin as the center of dilation, what are the coordinates of the vertices of the image?

• (-6,0), (-9,3), (6,15)
• (6,0), (9,-3), (-6,-15)
• (2/3,0), (1,-1/3), (-2/3,-5/3)
• (-1,-3), (0,-4), (-5,-8)

State the coordinate of the image of the given point B (-10,-6) under a dilation with center at the origin with the given scale factor k = 1/2.

• (5,3)
• (20,12)
• (-20,-12)
• (-5,-3)

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

Find the missing length indicated.

• 30
• 25
• 45
• 50

Solve for x.

• 25
• 10
• -10
• -25

Find the missing length indicated. 

• 16
• 8
• 10
• 14

Find the missing length indicated.

• 42
• 11
• 21
• 30

Solve for x.

• 7
• 14
• 10
• 5