Circumference = 2 * radius * pi (where pi is approx = 3.14159)
So Radius = Circumference / (2 * pi)
Circumference = 2*pi*radius
Divide the circumference by 2PI to find the radius. ( C = 2PI*Radius)
Diameter = circumference/pi Radius = circumference/2*pi
If you mean the diameter and radius of a circle given the circumference it is:- diameter = circumference/pi radius = circumference/(2*pi)
To find the circumference of a circle the formula is: 2*pi*radius or diameter*pi
divide 3.14 by circumference and d=2r
Divide the circumference by (2*pi)
Radius = square root of (area/pi) Circumference = 2*pi*radius
circumference = 2 x π x radius ⇒ radius = circumference ÷ (2 x π) Divide the circumference by two times π (≈ 6.283).
If the circumference or diameter is given then you can find the radius or simply measure the distance from the centre of the circle to the circumference.
C = pi d By algebraic rearrangement d = C / pi
Divide the circumference by the value of Pi, then halve that result.
circumference of a circle = 2*pi*radius or pi*diameter