5
QuizMultiple Choice

Dilations

Question 5 • SRC 2022 M/J Grade 8 Pre-Algebra Q1

Which statement about a dilation with a scale factor of 3 is true?

Answer
A
Three is added to each side in the pre-image to find the corresponding side length in the image.
B
Three is subtracted from each side in the pre-image to find the corresponding side length in the image.
C
Each side in the pre-image is multiplied by three to find the corresponding side length in the image.
D
Each side in the pre-image is divided by three to find the corresponding side length in the image.

Explanation

A dilation with a scale factor of 3 multiplies every length in the pre-image by 3 to get the corresponding length in the image. For example, a side that is 4 units long becomes 12 units long. So the true statement is that each pre-image side is multiplied by three.

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