Well, if you know the diameter you divide that by two to get the radius.
Circumference=2*pi*radius
radius = circumference/2*pi
You can either measure it, or calculate it if you know the diameter (radius = diameter / 2), or the circumference (radius = circumference / (2pi)).
Divide the circumference by 2*pi will give the radius of the circle.
Well, if you know the diameter you divide that by two to get the radius.
Dividing the circumference by 2*pi will give the value of the radius.
Circumference=2*pi*radius
Circumference of a circle = 2*pi*radius
If you know the circumference of a circle, you can find the radius by dividing the circumference by the value of Pi (3.14159...)
Radius (not raduis) =circumference/(2*pi)
radius = circumference/(2*pi)
radius = circumference/2*pi
You can either measure it, or calculate it if you know the diameter (radius = diameter / 2), or the circumference (radius = circumference / (2pi)).
The equation for circumference is C=2(pi)(r) where C is the circumference and r is the radius. You can find the radius by plugging in the circumference into this equation and solving the equation.
The circumference of a circle that has a radius of 5 inches is 10 X pi or approximatly 31.415926535897932384626433832795. If you know the radius you can find the circumference by multiplying it by 2(pi)
Where C=circumference, r= radius and d=diameter To find circumference: C=2 x pi x r or you can use the formula C=pi x d To find diameter just multiply the radius by 2 if you know what the radius is. If you do not know the radius, but you know the circumference and need diameter use the following formula: C/pi=d Happy Computing!!!