Tridecagon

A tridecagon or triskaidecagon is a polygon with 13 sides and 13 vertices.

Regular Tridecagon

A regular tridecagon is a polygon with 13 equal sides and angles.

Angles of the Tridecagon

The sum of interior angles of a tridecagon = (13 − 2) · 180° = 1,980°

The value of an interior angle of a regular tridecagon is: 1,980º : 13 = 152.31º

The central angle of a regular tridecagon measures: 360º : 13 = 27.69º

Diagonals of the Tridecagon

The number of diagonals in a regular tridecagon = 13 · (13 − 3) : 2 = 65

Perimeter of a Regular Tridecagon

Perimeter = 13 · l

Area of a Regular Tridecagon

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