A regular polygon has sides that are all equal and interior (inside) angles that are all equal.

An irregular polygon has sides that are not equal or interior (inside) angles that are not equal.

Quadrilaterals are polygons that have 4 sides.

A polygon is a flat (2D), closed figure made up of straight line segments.

Two lines are parallel if they are straight lines that are always the same (non-zero) distance apart.

Checking understanding of perimeter and area

Maths

Securing understanding of perimeter and area

Finding the perimeter of polygons

Calculating missing lengths with perimeter of polygons

Perimeter with composite rectilinear shapes

Area of a triangle

Using the formula for the area of a triangle

Area of composite rectilinear shapes

Calculating missing side lengths from the area of composite rectilinear shapes

Area of a trapezium

Calculating missing side lengths from the area of a trapezium

Problem solving with perimeter and area

In this unit pupils learn how to derive and use the formula for the area of a triangle and trapezium. In the future unit, this knowledge is called upon to find the volume of different prisms and area of composite shapes

In this unit, pupils explored the relationship between perimeter and area. In particular, they considered whether a shape can have the same area and perimeter value

In this unit pupils investigate how to calculate the area and perimeter of rectilinear shapes, and composite shapes using rectangles and triangles. They will also derive simple area formulae.

Perimeter and area

A parallelogram is a quadrilateral with two pairs of parallel and equal sides.

The area is the size of the surface and states the number of unit squares needed to completely cover that surface.

The perimeter is the distance around a 2D shape.

A compound shape is a shape created using two or more basic shapes.

A composite shape is an alternative term for a compound shape.

A composite rectilinear shape is a composite shape made from rectangles.

The base is the side which is perpendicular to the height.

The perpendicular height is the perpendicular distance from the base to the opposite vertex.

A trapezium is a quadrilateral with a pair of parallel opposite sides.

The plural of trapezium can be referred to as trapezia or trapeziums.

A trapezium is a quadrilateral with exactly one pair of parallel opposite sides.

Primary

Year 1

Year 2

Year 3

Year 4

Year 5

Year 6

Secondary

Year 7

Year 8

Year 9

Year 10

Year 11

Perimeter and area

Choose a lesson (12)