Circ = 2 x pi x r = 20 so pi x r = 10 so r = 10/pi = 3.18, taking pi as 22/7
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Circumference of a circle equals Pi times the double the radius C = 2 x 3.14 x radius C= 2 x 3.14 x 20 C = 125.6 The circumference of a circle with a 20 foot radius is 125.6 feet.
20
pi*r2 = 400*pi Therefore radius = 20 meters Cicumference = 2*pi* radius = 40*pi meters
Circumference = Pi * diameter. so Circumference = pi * 20 = 62.832
The circumference is pi x diameter, or 2 x pi x radius. In this case, 2 x pi x 10, approximately 20 x 3.14 = 60.28 meters.