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Pi is the circumference of (distance around) a circle divided by its diameter (largest distance across). The radius is one-half of the diameter. 2 pi radius means two times pi times the radius or 2 x pi x radius.
You can multiply in any order so this is the same as 2 x radius x pi.
2 x radius = diameter
diameter x pi = circumference (distance around)
2 pi radius is the circumference of a circle
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How do you find the diameter of a circle if they give you the area?
Area = pi * (radius^2) Where (radius^2) is radius squared, or radius to the second power. do some algebraic steps: Area / pi = radius^2 radius^2 = Area / pi square root (radius^2) = square root (Area / pi) radius = (plus or minus) square root (Area / pi) If you are not working with imaginary numbers then radius = square root (Area / pi)
What is the radius of a pipe that is 23 inches in circumference?
Circumference = 2 * Pi * radius Radius = 23 / (2 * Pi) Radius = 3.66 inches
What do you multiply the radius by?
circumference of a circle = 2*pi*radius area of a circle = pi*radius squared
What is the formula for a circle radius r?
Area of a circle = pi*radius2 Circumference of a circle = 2*pi*radius or diameter*pi Diameter of a circle = 2*radius
What is the radius of a 1 mile circle?
The radius is (Circumference/pi)/2. In this case it is (1 mile/pi)/2 Note: pi = 3.1415926535...
