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Circumference Calculator - Multi-Tools Website

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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units
Radius
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units
Diameter
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units
Area
-
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

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