Interior angles of a polygon

Maths

This unit gives pupils the opportunity to explore polygons and begin to generalise their understanding of interior/exterior angles in regular polygons. In the future unit, pupils will use the geometrical properties of a rhombus to perform various constructions

In this unit, pupils learnt how to calculate with angles at a point and angles on a straight line. In this unit, pupils extend their knowledge about angles in lines

Geometrical properties: polygons

A pentadecagon has 15 sides. The minimum number of triangles that it could be split into is {{}}.

An octadecagon has 18 sides. Which calculation would find the sum of its interior angles?

The interior angles in the hexagon sum to {{}}°. 

The interior angles of a pentagon sum to {{}}°.

The size of the angle $$x$$° is {{ }}°. 

An {{}} angle is an angle formed inside a polygon by two of its edges.

The interior angles of a triangle sum to {{}}°.

Starting with the smallest, sort the angles in ascending order of size.

This lesson will be removed by end of Summer Term 2025.

Interior angles of a polygon

Lesson outcome

This lesson will be removed by end of Summer Term 2025.