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Diameter of a circle

In geometry, the diameter of a circle is a line from one side directly to the opposite side through the centre. It can also be defined as the longest chord of a circle. The same explanations can be also used to describe the diameter in a sphere.

The letter d or the symbol are often used as a symbol for the diameter.[1] The diameter's length is often called the diameter itself.

The diameter's length is twice the radius,[2] and therefore the relationship between the diameter's length and radius can be shown with the equations:[3]

[math]d = 2r[/math] and [math]r = \frac{d}{2}[/math]

Related pages


  1. "List of Geometry and Trigonometry Symbols" (in en-US). 2020-04-17. 
  2. "Basic information about circles (Geometry, Circles)" (in en). 
  3. Weisstein, Eric W.. "Circle" (in en).