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Circle Area Calculator

This free online calculator will help you to find the area of a circle, when you know the langth of circle radius or circle diameter.

Using this online calculator, you will receive a detailed step-by-step solution to your problem, which will help you understand the algorithm how to find circle area.

  • Calculator
  • Guide
  • Some theory

Calculation of Circle Area

circle Select defined data
Input length of circle radius:
r =


You can input only integer numbers, decimals or fractions in this online calculator (-2.4, 5/7, ...). More in-depth information read at these rules.


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