If the angles are all equal and all the sides are equal length it is a regular polygon. To find the sum of interior angles in a polygon divide the polygon into triangles. The sum of interior ...

Each triangle has 180 ... where n is the number of sides In a regular polygon all the angles are equal. Each interior angle is calculated by dividing the sum of the interior angles by the ...

The ancient Greek mathematician Euclid proved in his Elements of Geometry that there are only five Platonic solids – the regular tetrahedron (four sides that are equilateral triangles), the cube (six ...