21 inches.
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A circle with a 12 inch diameter has a 6 inch radius.
The radius of a circle with a circumference of 42 meters is about 6.685 meters.
The circumference of a 42-inch diameter circle is: ~131.95 inches.
The Diameter of a Circle is twice the Radius.thus for a 52 inch Diameter Circle the Radius will be 52/2=26 inches.
Area of a circle: pi times radius squared