To find the diameter of a circle given its circumference, you can use the formula: diameter = circumference / π. In this case, the circumference is 130mm. So, the diameter would be 130mm / π ≈ 41.34mm.
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Circumference equals Diameter times Pi, OR Diameter equals (Circumference)/(Pi). In this case, Diameter equals (130mm)/(Pi or 3.14159) equals 41.38mm
circumference = pi*100mm
39 inches / pi = 12.4 inches
Radius is half of the diameter, so you can easily come up with a formula: L = 0.25 * pi * d2
I have a circle that measures 42" in diameter. I have to put fabric around that at a 2.5 to 1 fullness. What is the flat piece of fabric I need
circumferance