I would say 70 inches, but it depends on what you think you mean by "a 70-inch circle"
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A circle with a 12 inch diameter has a 6 inch radius.
The circumference of 9 inch diameter circle is about 28.27 inches.
The circumference of a circle with a 39 inch diameter is 122.52 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.
The area of 3.5-inch diameter circle is: 9.621 square inches.