Learn more about how angles in an 𝒏-sided polygon add to 180° × (𝒏 – 2) with this BBC Bitesize Maths article. For students between the ages of 11 and 14.

In other words, the area of the regular polygon equaled half the perimeter of the polygon times the radius of the inscribed circle. This is the example for a 16-sided figure. Compare 1985.0112.200 and ...