If the circumference is 20 the radius is 3.18
20
radius = 20/(2*pi) = 3.183098862 inches
Circumference = 2*Ï€*radius = 20*Ï€ feet
Divide the circumference by 2PI to find the radius. ( C = 2PI*Radius)
Circumference = 2*pi*radius So Radius = Circumference/(2*pi)
find the radius of a circle with circumference of 42.1
Circumference = 2 x Pi x Radius Radius = Circumference / (2 x Pi).
To find the circumference of a circle, use the equation: Circumference = 2*π*radius so when the radius is r, the circumference is 2πr
Circumference of a circle = 2*pi*radius
Circumference = 2 * radius * pi (where pi is approx = 3.14159)So Radius = Circumference / (2 * pi)
Diameter = circumference/pi Radius = circumference/2*pi