Icosagon

An icosagon is a polygon with 20 sides and 20 vertices.

Regular Icosagon

A regular icosagon is a polygon with 20 equal sides and angles.

Angles of the Icosagon

The sum of interior angles of a icosagon = (20 − 2) · 180° = 3,240°

The value of an interior angle of a regular icosagon is: 3,240º : 20 = 162º

The central angle of a regular icosagon measures: 360º : 20 = 18º

Diagonals of the Icosagon

The number of diagonals in a regular icosagon = 20 · (20 − 3) : 2 = 170

Perimeter of a Regular Icosagon

Perimeter = 20 · l

Area of a Regular Icosagon

Area of a Regular Pentagon Formula