A heptagon is a polygon with seven sides and seven vertices.
A regular heptagon is a polygon with seven equal sides and angles.
Angles of the Heptagon
The sum of interior angles of a heptagon = (7 − 2) · 180° = 900°
The value of an interior angle of a regular heptagon is: 900º : 7 = 128.57º
The central angle of a regular heptagon measures: 360º : 7 = 51.43º
Diagonals of the Heptagon
The number of diagonals in a regular heptagon = 7 · (7 − 3) : 2 = 14
Perimeter of a Regular Heptagon
Perimeter = 7 · l
Area of a Regular Heptagon