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Circumference = 2*pi*rRadius = diameter/2r = 20 cm/2 = 10 cm-------------------------Circumference = 2*pi(10 cm)= 63 centimeters===========
Diameter in cm = circumference/pi
Circumference = pi * diameter ---> Diameter = Circumference / pi. Radius = Diameter / 2.Taking pi approx 3.14: Dia = 31.4 cm / 3.14 = 10.0 cm. Radius = 10.0 cm /2 = 5.00 cm.
A circle with a radius (d/2) of 15 cm has a circumference of 94.2 cm
Circumference = πd diameter = 2 x radius