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

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

Understand that different shapes can have the same perimeter

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

Understand that the perimeter of a regular polygon can be calculated by multiplication

Calculate the side length of a regular polygon by division where the perimeter is known

Solve problems involving the perimeter and side lengths of polygons

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.

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

Select all of the statements that are true of polygons. 

Which of these shapes is a regular polygon?

Which of these shapes are regular polygons?

This shape has been made by putting number rods together. Select all of the statements that are true.

These shapes have been made by putting number rods together. Look closely at the sides shown by the lines. Which one is a regular polygon?

Select all of the statements that are true of regular polygons. 

Select all the shapes that have only straight sides.

Select all the two-dimensional (2D) shapes.

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

Lesson outcome