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O is the center of the circle and A, B, C are three points on the circle. Here OC or OA or OB is called as radius and AB is the diameter of the circle.

Given,

Area of the circle = A = 254.34 sq. m

Radius of the circle = r = ?

Hence the radius of the circle = r = 9 m

Given.

Circumference of a circle = C = 68 sq. cm

Radius of a circle = r = ?

Formula,