Scientific calculator
Evaluate arithmetic, powers, parentheses and common scientific functions.
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Math & calculators
Circle calculator
Calculate circle area and circumference from its radius.
Free to useProcessed on your device
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About this tool
Calculate circle area and circumference from its radius.
How to use
- Enter radius in the form.
- Choose the available options, then run circle calculator.
- Review the result and copy or download it for your work.
Outputs use the input length unit, or its square for area.
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