Internal angles of regular polygons - Geometry formula

The internal angle of n-sided regular polygon is $\dfrac{ n-2 }{ n } 180^{\circ}$ degrees.

Side Angle
3 60
4 90
5 108
6 120
8 135
10 144
12 150

\[ \theta = \frac{ n-2 }{ n } 180^{\circ} \]

Regular polygon

Formula