Question

A rectangle has a perimeter of 30. It is dilated by a scale factor of 2.

What is the new perimeter?

Answer 1

It is 60.

Explanation:

When shapes are dilated (when they get bigger or smaller), perimeter changes linearly—in direct proportion with length. This means if the scale factor is 2, then you multiply it by 2. 2 multiplied by 30 equals 60.