Diameter
straight line segment that passes through the center 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.
![](http://upload.wikimedia.org/wikipedia/commons/7/78/Diameter.png)
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]
and
Related pages
References
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