Circumference Calculator
Radius (r)
units
Diameter (d)
units
Area (A)
square units
Results
Formulas Used
- Circumference: C = 2πr
- Circumference from diameter: C = πd
- Circumference from area: C = 2π√(A/π)
Where π (pi) ≈ 3.14159
Circumference
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Radius
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Diameter
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Area
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square units
Interesting Facts
- The ratio of a circle's circumference to its diameter is always π (pi)
- The circumference is the distance around the circle
- For any circle, the circumference is approximately 3.14 times its diameter
- The circumference is directly proportional to the radius