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| | Diameter - Facts, Information, and Encyclopedia Reference article |
 | | For the authentication, authorisation, and accounting protocol, see DIAMETER. |
 | | In geometry, a diameter (Greek words diairo = divide and metro = measure) of a circle is any straight line segment that passes through the center and whose endpoints are on the circular boundary, or, in more modern usage, the length of such a line segment. |
 | | When using the word in the more modern sense, one speaks of the diameter rather than a diameter, because all diameters of a circle have the same length. |
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