Scale Factor and Dilations Perimeter and Area

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

• addition 

• subtraction 

• multiplication 

• division 

If the blue polygon is the original image, find the scale factor and determine if it is a reduction or enlargement.

• It's a reduction; the scale factor is 2.

• It's an enlargement; the scale factor is 2.

• It's an enlargement; the scale factor is 1/2.

• It's a reduction; the scale factor is 1/2.

Triangle ABC will be dilated by a scale factor of 1/2.  What will be the coordinates of C'?

• (-1, -2.5)

• (12, 6)

• (3, -1.5)

• (0, 1.5)

Rectangle ABCD is dilated so that A' is located at (3, 6). What could be the scale factor?

has the following coordinates J(-8,2), K(7,9), L(9,-12). When dilated the new coordinates are J'(-2,0.5), K'(1.75,2.25), L'(2.25,-3). What is the scale factor?

• -1/4

• -4

• 1/4

• 4

PQRST is a scaled copy/ dilation of ABCDE. What is the scale factor from ABCDE to PQRST?

True or false: Figure L is a scaled copy/dilation of figure S.

• True

• False

The original figure is in the top left. What is the scale factor from the original to Figure A?

The original figure is in the top left. What is the scale factor from the original to Figure C?

• 1/2

• 1

• 3/2

• 2

Which figure is a scaled copy/ dilation of Shape A?

• Shape B

• Shape C

• Shape D