###### Asked in Math and ArithmeticAlgebraGeometry

Math and Arithmetic

Algebra

Geometry

# Derive the formula for radius if the formula is c equals pi times r squared?

## Answer

###### Wiki User

###### July 12, 2009 5:23PM

Where pi (~ 3.1416) is represented by *π,* The formula C=
*π*r2 yields the formula r2 = (C/*π*) therefore r =
square root (C/*π*). ...which is the same as : r =
(C/*π*)1/2.

## Related Questions

###### Asked in Geometry, Algebra

### Formula of circle?

###### Asked in Math and Arithmetic, Algebra, Geometry

### Connection between the circumference and the diameter of a circle?

Divide the diameter by 2, this will give you the radius.
multiply the radius by the radius, this gives you the radius
squared. Multiply the raduis squared by Pi (3.14) to get the
circumference.
Formula : Circumfrence = Pi X R squared
so, if the diameter is 10, the radius is 5, the radius squared
is 25, 25 X 3.14= circumference

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