Math
Circle Area Calculator
Find the area inside a circle from its radius.
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Formula
Circle area = π × radius squared.
How it works
Enter the radius, the distance from the centre to the edge. The calculator squares it and multiplies by pi.
FAQs
What does the Circle Area do?
It takes the values you enter and works out the circle area for you, showing the result straight away.
What should I enter?
Enter ordinary numbers in the boxes above. If a value does not make sense for this calculation, the page will ask you to check it instead of showing a wrong answer.
Can I use the result for homework or everyday maths?
Yes. It is a general-purpose maths helper; for exam or professional work, still check the steps against your own working.