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

How many sides does a quadrilateral have?

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

A {{}} polygon has sides that are all equal and interior angles that are all equal

What is the length of the line marked $$b$$? 

Calculate the length of the marked side in the composite rectilinear shape.

True or false? The angle marked on the shape is an interior angle.

What is the mathematical name for this shape?

The unique name for an angle that measures 90 degrees is a {{}}. 

What is the length of the marked side of the parallelogram?

Checking understanding of perimeter and area

Lesson outcome