70/2pi ie 35/pi = 11.14 ft
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diameter = 70/pi
Area of the circle: pi*70 squared = 4900*pi square feet
divide the circumference by 3.14 to get the diameter - then divide that by 1/2 to get the radius Radius = Circumference / 2 x pi from C = Diameter x pi
The circumference of a 70 foot diameter circle is 219.9 feet.
Presumably you mean "radius"... 70 pi sq mm