Concept

Diameter

The diameter of a circle is a line segment that goes from one side of the circle's circumference, through the center of the circle, to the opposite side.

Diameter1 en.svg

Since every circle is symmetrical, its diameter can be measured from any point on the circumference to its corresponding opposite, so long as the segment passes through the center. Furthermore, the diameter of a circle is exactly twice as long as its radius.

Diameter2 en.svg

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