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The diameter of a circle or a sphere is the length of the segment joining a point with the one symmetrical respect to the center. That is, the length of the longest segment joining a pair of points.
Also, we call any of these segments themselves a diameter. So, in the next picture,  is a diameter.
The diameter is equal to twice the radius.
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"diameter" is owned by drini. [ owner history (1) ]
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Cross-references: radius, center, point, segment, length, sphere, circle
There are 25 references to this entry.
This is version 17 of diameter, born on 2002-02-15, modified 2002-02-23.
Object id is 1991, canonical name is Diameter2.
Accessed 13801 times total.
Classification:
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Pending Errata and Addenda
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![\includegraphics[scale=0.625]{diameter.eps}](http://images.planetmath.org:8080/cache/objects/1991/js/img2.png "\includegraphics[scale=0.625]{diameter.eps}")