To find the size of one interior angle of a regular polygon, divide the sum of the interior angles by the number of sides.

Learn how to apply formulae for the interior and exterior angles of a polygon and how to create tiling patterns and tessellations with this GCSE guide.

Interior angles of polygons To find the sum of interior angles in a polygon divide the polygon into triangles. The sum of interior angles in a triangle is 180°.

Interior angles of polygons To find the sum of interior angles in a polygon divide the polygon into triangles. The sum of interior angles in a triangle is 180°.

Learn how to apply formulae for the interior and exterior angles of a polygon and how to create tiling patterns and tessellations with this GCSE guide.

In this Maths article, learn how to use a formula to find out the internal angles within a polygon.

The formula for calculating the size of an exterior angle in a regular polygon is: 360 ÷ number of sides. If you know the exterior angle you can find the interior angle using the formula ...

Learn how to measure interior and exterior angles in polygons with this BBC Bitesize Maths article. For students between the ages of 11 and 14.