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, AB is a diameter.

The diameter is equal to twice the radius.

Title diameter
Canonical name Diameter1
Date of creation 2013-03-22 12:20:42
Last modified on 2013-03-22 12:20:42
Owner drini (3)
Last modified by drini (3)
Numerical id 20
Author drini (3)
Entry type Definition
Classification msc 51-00
Related topic Radius
Related topic VolumeOfSphericalCapAndSphericalSector