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

The radius of a circle is any line segment that joins the centre of a circle to its edge.

The diameter of a circle is any line segment that starts and ends on the edge of the circle and passes through the centre.

Area of a circle

Maths

In this unit, pupils have derived the formula for the circumference and area of a circle. In the future unit, this knowledge is combined with knowledge of fractions to find the arc length and area of a sector.

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

Perimeter, area and volume

Which is a correct formula for calculating the area of a circle?

The area of the circle is equal to the area of the parallelogram. The circumference of the circle is 12$$\pi$$ cm. The base of the parallelogram is {{ }}.

The area of the square is 10 cm. The area of the circle is {{ }}.

A circle has radius 6 cm. What is the area of the circle?

Which circle has an area of 9$$\pi$$ cm$$^2$$?

The area of the circle is {{ }}$$\pi$$ cm$$^2$$.

The {{ }} is any line segment that joins the centre of a circle to its edge.

Which of the following formulae calculates the circumference of a circle, when the radius is known?

Which two calculations could be used to find the area of the parallelogram?

The first four digits of $$\pi$$ are {{}}.

Select the parallelogram with the smallest area.

This lesson will soon be taken down.

Area of a circle

Lesson outcome