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Radius Converter

Convert between radius, diameter, circumference, area, sphere volume and sphere surface area

How to use the radius converter

This converter uses the following equations based on the radius r:

  • Circle diameter = 2r
  • Circle circumference = 2πr
  • Circle area = πr2
  • Sphere volume = 4πr3/3
  • Sphere surface area = 4πr2