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# Diameter

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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

## References

- ↑ "List of Geometry and Trigonometry Symbols" (in en-US). 2020-04-17. https://mathvault.ca/hub/higher-math/math-symbols/geometry-trigonometry-symbols/.
- ↑ "Basic information about circles (Geometry, Circles)" (in en). https://www.mathplanet.com/education/geometry/circles/basic-information-about-circles.
- ↑ Weisstein, Eric W.. "Circle" (in en). https://mathworld.wolfram.com/Circle.html.