Diameter - Wikipedia In geometry, a diameter of a circle is any straight line segment that passes through the centre of the circle and whose endpoints lie on the circle It can also be defined as the longest chord of the circle Both definitions are also valid for the diameter of a sphere In more modern usage, the length of a diameter is also called the diameter In this sense one speaks of the diameter rather
Diameter of a Circle - Definition, Examples | Diameter Formula - Cuemath Diameter of a Circle The diameter of a circle is a line that passes through the center and meets the circumference at opposite ends It is twice as long as the radius of the circle In other words, the diameter of a circle is the line that passes through the center and divides the circle into two equal parts Let us learn more about the diameter definition, the diameter formula, and learn how