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Circumference to Radius of Circle Calculator

Calculate Radius of Circle
Circumference (C) [?]
Radius (r) [?]

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Switch tool with the current settings for radius, and calculate circle area, circle diameter, sphere volume or sphere surface area instead


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Contents

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  • User Guide
      • Formula
          • Symbols
      • Circumference of Circle
      • Radius of Circle

User Guide

This tool will calculate the radius of a circle from the circumference, and will convert different measurement units for circumference and radius.

Formula

The formula used to calculate the circle radius is:

r = C / (2 · π)

Symbols
  • r = Circle radius
  • C = Circle circumference
  • π = Pi = 3.14159…

Circumference of Circle

Enter the circumference which is the total length of the edge around the circle, if it was straightened out.

Radius of Circle

This is the radius of a circle that corresponds to the specified circumference. The radius is the distance between the centre and any point on the outer edge of a circle.

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