Circumference = Pi x diameter.

e.g. What is the circumference of a circle with a diameter of 4cm? Give your answer to two decimal places.

Practice Question: Work out the circumference of the circle when its radius is 6mm. Give your answer to two decimal places.

Area = Pi x radius squared.

e.g. What is the area of a circle with a radius of 3cm? Give your answer to two decimal places.

- Pi x 3squared = 9.42cm (2.d.p).

Practive Question: Work out the area of a circle with a diameter of 14mm. Give your answer to two decimal places.

Remember: Sometimes exam questions could ask for the circumference of a circle but give you the radius instead of the diameter.

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