Regular Polygon Calculator
From Number of Sides & Side Length
From Number of Sides & Apothem
From Number of Sides & Area
Formula
A = (1/2)*P*a | a = s/(2*tan(pi/n)) | Interior = (n-2)*180/n
Frequently Asked Questions
How do you calculate the area of a regular polygon?
Area = (1/2) * perimeter * apothem, or Area = (n * s^2) / (4 * tan(pi/n)), where n is the number of sides and s is the side length.
What is the interior angle formula for a regular polygon?
Interior angle = ((n-2) * 180) / n degrees, where n is the number of sides. For example, a regular heptagon (7 sides) has interior angles of about 128.57 degrees.
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