What is Diameter?
[[Image:Diameter.png|thumb|Diameter of a circle]] In [[geometry]], the '''diameter''' of a [[circle]] is a line from one side directly to the opposite side through the center. 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.<ref>{{Cite web|last=|first=|date=2020-04-17|title=List of Geometry and Trigonometry Symbols|url=https://mathvault.ca/hub/higher-math/math-symbols/geometry-trigonometry-symbols/|archive-url=|archive-date=|access-date=2020-09-24|website=Math Vault|language=en-US}}</ref> The diameter's length is often called the diameter itself. The diameter's length is twice the [[radius]],<ref>{{Cite web|title=Basic information about circles (Geometry, Circles)|url=https://www.mathplanet.com/education/geometry/circles/basic-information-about-circles|access-date=2020-09-24|website=Mathplanet|language=en}}</ref> and therefore the relationship between the diameter's length and [[radius]] can be shown with the equations:<ref>{{Cite web|last=Weisstein|first=Eric W.|title=Circle|url=https://mathworld.wolfram.com/Circle.html|access-date=2020-09-24|website=mathworld.wolfram.com|language=en}}</ref> <math>d = 2r</math> and <math>r = rac{d}{2}</math> == Related pages == * [[Circumference]] * [[Pi]] == References == {{reflist}} {{Math-stub}} [[Category:Geometry]]