Dilation Review

A dilation is which of the following:

• process to make an object shrink

• process to make an object shrink by a sequence

• process to make enlarge an object

• process to either enlarge or shrink an object

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)

In a dilation what mathematical operation is used with the scale factor?

• addition 
• subtraction 
• multiplication 
• division 

If the point A(12, 8) is dilated by a scale factor of 1/2, what are the coordinates of the image point, A'?

• (24, 16)

• (6, 4)

• (4, 6)

• (12.5, 8.5)

Dilate Point B by a scale factor of 3:

• (12,0)
• (12,12)
• (4,3)
• (0,12)

When A(3, 6) is under a dilation of 2 what are the coordinates of A'?

• (3, 6)

• (1.5, 3)

• (6, 12)

• (12, 6)

Triangle ABC with coordinates A(3,3) B(6,6) C(9,3) was dilated from the origin by a scale factor of 3. What are the coordinates of triangle A'B'C'?

• 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)

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

• ½

• ¼

• 4

• 2

A triangle has vertices A(0,0), B(8,0), C(3,-2). Find the coordinates of the triangle after a dilation with a scale factor of 4.

• A'(4,4), B'(32,4), C'(12,-8)

• A'(4,4), B'(12,4), C'(7,2)

• A'(0,0), B'(32,0), C'(12,-8)

A dilation means to _________ a figure.

• Flip

• Turn

• Reduce or enlarge a figure

• Slide