You're supposed to know that
Circumference = (pi) x (diameter)
Divide each side of this equation by (pi) :
Diameter = Circumference/pi
And you also know that Diameter = 2 x Radius .
2 x Radius = Circumference/pi
Divide each side of that one by 2 :
Radius = Circumference/2 x pi .
and that's exactly what you need.
Remember the circle equations.
C = pi d
or
C = 2 pi r
NB d = 2r
By algebraic rearrangement
r = C / (2 pi)
C = pi d By algebraic rearrangement d = C / pi
circumference = pi * 2radius (diameter) so to find radius you use circumference/(2 x pi) this will find radius ----
Circumference equals the diameter times pi. The diameter is 2 times radius. Radius equals Circumference divided by pi then divided by 2.
Circumference is equal to pi x diameter Diameter is equal to 2 times the radius Circumference would be 2 x pi x radius
If you are given the radius of the circle, you can use the formula: diameter = 2*radius If you are given the circumference of the circle, you can use the formula: diameter = circumference/pi
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)
Circumference = 2 * radius * pi (where pi is approx = 3.14159)So 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.