Dodecagon

A dodecagon is a polygon with 12 sides and 12 vertices.

Regular Dodecagon

A regular dodecagon is a polygon with 12 equal sides and angles.

Angles of the Dodecagon

The sum of interior angles of a dodecagon = (12 − 2) · 180° = 1,800°

The value of an interior angle of a regular dodecagon is: 1,800º : 12 = 150º

The central angle of a regular dodecagon measures: 360º : 12 = 30º

Diagonals of the Dodecagon

The number of diagonals in a regular dodecagon = 12 · (12 − 3) : 2 = 54

Perimeter of a Regular Dodecagon

Perimeter = 12 · l

Area of a Regular Dodecagon

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