Math and Arithmetic

Algebra

Geometry

# What value should you get if you divide the area of any circle by the square of its radius?

###### Wiki User

###### December 06, 2007 12:00AM

You will get pi since area of a circle equals pi* times radius squared....by Mona Martinez

## Related Questions

###### Asked in Geometry

### What is the formula for area of a half circle but you don't have the radius?

If you have the diameter, then the formula for the area of a
semi-circle is:
(pi x (diameter/2)2)/2
That is,
Divide the diameter in two to find the radius (diameter/2)
Square the radius (radius x radius)
Multiply it by pi (3.1416)
Divide the answer by two to find half the circle.
Remember your units. The answer will be in square inches, or
square centimeters or square somethings.

###### Asked in Geometry

### How do you get the diameter of a circle?

That depends on what you know.
If you know the radius of the circle, double it to get the
diameter.
If you know the circumference of the circle, divide it by π to
get the diameter.
If you know the area of the circle, find its square root and
divide the result by π to get the radius then multiply by 2 to get
the diameter.

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

### What is the area of a 12 inch and a 9 inch circle?

If you are talking about 9 and 12 inch diameter, then divide
both by 2 to get the radius. The area of a circle is pi (3.1415 is
good for most calculations) multiplied by the square of the radius.
So for the 12 inch circle, the radius is 6. The square of the
radius is 36, and multiplying this by pi gives approximately 113.1
square inches.
Now the 9 inch circle has a radius of 9/2 or 4.5. Squaring this
we get 20.25, which multiplied by pi is approximately 63.6 square
inches.
If 9 and 12 were already the radius in the problem, just don't
divide by 2 since you already have the radius.