About the Polygon Angle Calculator
Interior and exterior angles, forward and in reverse.
What it is
The Polygon Angle Calculator computes the sum and per-angle interior and exterior angles of any regular polygon from its number of sides, and can also work backwards โ given a known interior or exterior angle, it solves for the number of sides, flagging clearly when no whole-sided polygon matches.
Features
Forward mode
Sides to interior and exterior angles, sum and per-angle.
Reverse mode
Angle to number of sides, with validation for non-matching angles.
Polygon naming
Automatic naming from triangle through decagon, then "n-gon".
Diagram
A scaled regular polygon drawn for the current number of sides.