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Circle Calculator

Choose a Calculation:
Enter
r = 
   
a = 
c = 

Notes and Formulas for a Circle:

  • Given the radius find the area and circumference
    • a = Π * r^2
    • c = 2 * Π * r
  • Given the area find the radius and circumference
    • r = square root (a / Π)
    • c = 2 * Π * r
  • Given the circumference find the radius and area
    • r = square root (a / Π)
    • a = Π * r^2
Free online calculator for circles

Circle Diagram with Radius
r = radius
a = area
c = circumference
Π = Pi

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