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Diameter is twice the radius of circle. This formula is used to analyze the diameter of different figures such as planet etc. The general standard unit for diameter of circle is m or cm or km.

It will be more clarified by the below mentioned examples.

=> We know that Circumference of circle = 2 * pie * r

=> Circumference of circle = 2* pie *r = 44

=> 2 * pie * r = 44

=> 2 * 22/7 * r = 44

=> We know that, Area of circle = pie * r * r

=> 22 = pie * r* r

=> Therefore, pie* r * r = 22

=> 22/7 * r^2 = 22

=> Now r^2 = (22/22) * 7

=> So r^2 = 1 *7

=> This thing implies, r = (7) ^1/2 = 2.65