Al noticed that the ratio of the perimeters of two similar figures is equal to the ratio of the side lengths. "What about the area? Does it grow the same way?" he
wondered.

The original rectangle has an area of 21 in 2 and a
perimeter of 20 in.

Al enlarged the rectangle by a zoom factor of 2.
What are the dimensions of the new rectangle?
What are the area and perimeter?

Explain.

Does the perimeter double? Does the area double?
Explain what happened.

Explain.