Oh, dude, you're hitting me with some math now? Alright, so the circumference of a circle is just π times the diameter, which in this case would be 38π inches. You could calculate the exact number, but like, who has time for that? Just know it's around 119.38 inches, give or take a decimal or two.
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Circumference of a circle = π x DC = 3.14159 x 38C = 119.38 inches
It is customary to call a circle a 38 inch circle if its diameter is 38 inches. If that is the case, the radius = diameter/2 = 19 inches.
38/pi = 12.09577567 or about 12 feet
if the diameter is in feet then multiply the diameter by pi 38 x 3.14159 = 119.38042 square feet if the diameter is in inches then dividethe inches by 12 then multiply the diameter by pi 38 ÷ 12 = 3.16666 x by 3.14159 = 9.94835 square feet
119.32