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Circumference = 2*pi*rRadius = diameter/2r = 20 cm/2 = 10 cm-------------------------Circumference = 2*pi(10 cm)= 63 centimeters===========
Circumference = πd diameter = 2 x radius
Circumference = 2*pi*r = 12.566 cm (approx)
Circumference = 2*pi*r = 147.7 cm.
Circumference = 2*pi*15.5 in cm