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Diameter = 11.14 inches (approx) ~ Circumference can be found by pi * diameter.
A = 962.11 units2
Circumference = 2*pi*rr = diameter/2 = 70/2 = 35 yards2*pi(35 yards)= 220 yards in circumference===================
Radius: 35/2 = 17.5cm
195 laps.