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.

The sum of interior angles in a triangle is 180°. To find the sum of interior angles of a polygon, multiply the number of triangles in the polygon by 180°.

Remember: The sum of the angles in a triangle is 180°. To find the sum of the interior angles of a polygon, multiply the number of triangles in the polygon by 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.

All polygons close polygon A 2D shape with straight sides that are fully closed. have interior angles. The number of angles is equal to the number of sides it has. Triangles close triangle A ...

There are lots of different types of polygon. Find out about quadrilaterals, triangles, ... You also know that the interior angles in a triangle always add up to 180°.