# Circles - Area of a circle Part 3

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- Created by: Jake Popple
- Created on: 03-04-12 12:41

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There is only one formula for the area of a circle:

A = πr2

We must therefore remember to use the radius each time:

Question 1: Find the area of a circle with a diameter of 20 cm. Use the π button on my calculator, and give the answer correct to 1 dp.

Answer 1: We have been told…

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