Answer :

In a regular polygon, all of the sides have the same length.

Pentagons have five sides. If one of the sides in a regular pentagon is 4 feet, then the rest will also be four feet. 5 sides that are all 4 feet long totals up to a 20-foot perimeter.
A regular polygon has all sides equal. There are 5 sides all equaling 4 ft, so 4⋅5= a 20 ft perimeter.

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