The circumference of a circle with a diameter of 39 centimeters is about 122.5 cm (C = d x Pi)
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The circumference of a circle with a 39 inch diameter is 122.52 inches.
Circumference equals pi times diameter. Therefore you divide 39 by pi and get about 12.41
39 inches / pi = 12.4 inches
First we have to find the radius: pi*radius2 = 120 sq ins Divide both sides by pi and then square root both sides: radius = 6.180387232 inches circumference = 2*pi*radius circumference = 38.83251825 or 39 inches to the nearest inch.
39 square centimeters is 6.04 square inches.