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Definition Of Diameter

Diameter is a line segment that passes through the center of a circle with both its endpoints lying on the circle.

More About Diameter

A diameter is the longest chord of a circle.
A diameter is double the radius of a circle.

Example of Diameter

In the circle shown, the line segments AB and PQ are the diameters of the circle. Notice that they have their endpoints on the circle and that both of them pass through the center O of the circle.

 example of  Diameter

Video Examples: How to Convert Diameter Into Feet : Math Conversions

Solved Example on Diameter

Ques: Sunny bought a circular ring of diameter 32 cm. Find the radius of the ring.


A. 64 cm
B. 32 cm
C. 16 cm
D. 8 cm
Correct Answer: C


Step 1: Diameter of a circle = 2 × radius.
Step 2: Therefore, radius =  example of  Diagonal.