Regular pentagon: find the interior angle

An example figure from the Regular Polygon Generator.

A regular pentagon with its bottom side labeled 6 and the angle in its bottom left corner marked with an arc and labeled x — A regular pentagon with its bottom side labeled 6. The interior angle in its bottom left corner is marked with an arc and labeled x, for students to find from the number of sides. No center or other lines are drawn.

Edit this figure Download PNG

Editing opens it in the Regular Polygon Generator with these settings, to change anything and copy or download your own.

Answer key

Pentagon: 5 sides
Side 6, apothem 4.1, radius 5.1
Each interior angle 108°, central angle 72°
Perimeter 30, area 61.9

Free to use in your tests, worksheets, slides or anything else. Open source under Apache 2.0. How to reuse our figures

More Regular Polygon examples

Make your own in the Regular Polygon Generator →