The formula for circumference is pi times diameter. Since a radius is always half the diameter, you just multiply it by 2 and then by pi.
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Divide the circumference by 2PI to find the radius. ( C = 2PI*Radius)
easy you just double it. Additional answer No, that's incorrect. If you double the radius you get the diameter. To get the circumference you multiply the radius by 2 then by 3.142. 3.142 is known as pi
find the radius of a circle with circumference of 42.1
To find the circumference of a circle, use the equation: Circumference = 2*π*radius so when the radius is r, the circumference is 2πr
Diameter = circumference/pi Radius = circumference/2*pi