how do i solve this ?

Question

a regular decagon has side lengths measuring 4.5 ft, then the perimeter is  ft.

Answer 1

In a regular polygon all sides are of equal length. A decagon is a ten sided polygon. A regular decagon is a ten-sided figure where all sides are equal. So if one side is 4.5 feet, then the perimeter is 10 * 4.5 = 45 feet.