Enneadecagon

An enneadecagon is a polygon with 19 sides and 19 vertices.

Regular Enneadecagon

A regular enneadecagon is a polygon with 19 equal sides and angles.

Angles of the Enneadecagon

The sum of interior angles of a enneadecagon = (19 − 2) · 180° = 3,060°

The value of an interior angle of a regular enneadecagon is: 3,060º : 19 = 161.05º

The central angle of a regular enneadecagon measures: 360º : 19 = 18.95º

Diagonals of the Enneadecagon

The number of diagonals in a regular enneadecagon = 19 · (19 − 3) : 2 = 152

Perimeter of a Regular Enneadecagon

Perimeter = 19 · l

Area of a Regular Enneadecagon

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