Circle Calculator
The area of a circle is π times the square of its radius.
The defining measurement of a circle is the radius. Area is πr²; circumference is 2πr.
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Example problems
How this solver works
- Read the radius.
- Return r²π as the exact area.
Formula
Area of a circle.
Worked examples
r = 5
- 25π
Answer: 25π
Common mistakes
Squaring π
π is multiplied by r²; you do not square π for area.
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Frequently asked questions
Exact or decimal?
Exact 25π is preferred unless a problem asks for a decimal approximation.