Regular Polygons

A regular polygon is when all the side lengths and angles are the same and don't intersect each other.

Equilateral Triangle

Number of sides = 3:
Number of vertices = 3:
Interior angle = 60°:
Exterior angle = 120°:
Exterior angle multiplied by the number of sides = 360°:
Number of sides = number of vertices:

Cube

Number of sides = 4:
Number of vertices = 4:
Interior angle = 90°:
Exterior angle = 90°:
Exterior angle multiplied by the number of sides = 360°. (90°X4=360°):
Number of sides = number of vertices:

Pentagon

Number of sides = 5:
Number of vertices = 5:
Interior angle = 108°:
Exterior angle = 72°:
Exterior angle multiplied by the number of sides = 360°. (72° X 5 = 360°):
Number of sides = number of vertices:

Hexagon

Number of sides = 6:
Number of vertices = 6:
Interior angle = 120°:
Exterior angle = 60°:
Exterior angle multiplied by the number of sides = 360°. (60° X 6 = 360°):
Number of sides = number of vertices:

Heptagon

Number of sides/verticies = 7

Interior angle = 128.57

Exterior angle = 51.53

Octagon

Number of sides/verticies = 8
Interior angle = 135

Exterior angle = 45

Nonagon

Number of sides/verticies = 9
Interior angle = 140

Exterior angle = 40

Decagon

Number of sides/verticies = 10

Interior angle = 144
Exterior angle = 36