The approximate diameter of a circle whose circumference is 21cm is: 6.68cm
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The circumference of a circle whose area is 16 times the area of a circle whose diameter is 1.4m is: 17.6 cm
Circumference = 7*pi which is about 22 inches
circumference = pi*56 = 175.929 cm to 3 dp
Circumference = 2.4*pi cm 7.53982 cm
The circum. = pi x diameter so divide circum. / pi = diameter