A polygon where all angles are equal and all side lengths are equal.

A polygon where not all angles are equal and / or not all side lengths are equal.

Interior angles are the angles formed inside a polygon by two of its sides.

Know that a regular polygon has sides that are the same length and angles that are the same size

Maths

In this unit pupil will learn perimeter as the distance around the edge of a 2D shape. They will learn perimeter is measured in units of length found by counting units and by calculating by adding the side lengths of a 2D shape. In the future unit pupils will pupils will complete and compose symmetrical shapes from two congruent shapes and investigate lines of symmetry in 2D shapes. 

In the prior unit pupils investigated ways to compose and decompose polygons. They investigated quadrilaterals with and without parallel and perpendicular sides. In this unit pupil will learn perimeter as the distance around the edge of a 2D shape. They will learn perimeter is measured in units of length found by counting units and by calculating by adding the side lengths of a 2D shape.

Perimeter

Know that the perimeter is the distance around a 2D shape

A polygon is a 2D shape made up of 3 or more straight lines.

The distance around a two-dimensional shape.

Understand that different shapes can have the same perimeter

The unit of one of something that defines the 'one' you are counting in.

Know that perimeter is measured in units of length and can be found by counting or measuring units

Know that perimeter can be calculated by adding together the side lengths of a 2D shape

Know that the perimeter of a rectangle can be calculated by addition and multiplication

Know that unknown side lengths can be calculated from the perimeter and known side lengths

A regular polygon has all sides equal and all angles equal.

Perimeter

Choose a lesson (10)

These lessons will be removed by end of Summer Term 2025.