C = 22 meters.
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A circle with a radius of 35 inches has a circumference of 219.91 inches.
Circumference of circle: 2*pi*35 = 220 m rounded to the nearest whole number
70/2pi ie 35/pi = 11.14 ft
Presumably you mean "radius"... 70 pi sq mm
Since you didn't provide a number, I'll make one up. A circle with a circumference of 35 m has a diameter of approximately 11 m.