Question

The regular pentagon shown below has sides that are each 7 inches long.

This regular pentagon is changed proportionally and is dilated by a scale factor of 2.
What is the perimeter of the new pentagon after the dilation occurs?
6 7 in->

Answer 1

70 inches

Explanation:

The dilation makes each of the 5 sides be 2·(7 in) = 14 in. Then the total length of those 5 sides is ...

P = 5·(14 in) = 70 in

The perimeter of the new pentagon is 70 inches.