Pentadecagon

A pentadecagon is a polygon with 15 sides and 15 vertices.

Regular Pentadecagon

A regular pentadecagon is a polygon with 15 equal sides and angles.

Angles of the Pentadecagon

The sum of interior angles of a pentadecagon = (15 − 2) · 180° = 2,340°

The value of an interior angle of a regular pentadecagon is: 2,340º : 15 = 156º

The central angle of a regular pentadecagon measures: 360º : 15 = 24º

Diagonals of the Pentadecagon

The number of diagonals in a regular pentadecagon = 15 · (15 − 3) : 2 = 90.

Perimeter of a Regular Pentadecagon

Perimeter = 15 · l

Area of a Regular Pentadecagon

Area of a Regular Pentagon Formula