The distance around a two-dimensional shape.

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

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

It is impossible to give the perimeter because there are missing side lengths.

Which calculations will give the perimeter of this rectangle?

What is the perimeter of this rectangle? {{  }} units.

Order these rectangles from shortest to longest perimeters.

Which expressions could be used to work out the perimeter of the shape?

What is the perimeter of this shape? {{  }} units.

Which of these expressions means the same as doubling 10?

Which of these statements is true of a rectangle?

This lesson will soon be taken down.

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

Lesson outcome