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Area of a circle = πr2, where π is the symbol for pi and is 3.14159... , and r is the radius. If you are using a scientific calculator, you will probably have a key for π. Once you have the radius, it's just a matter of correctly entering it into your calculator according to the formula. The unit for area is squared, for example 32in2 or 59m2.

Area of a circle equals 3.14r^2.

So multiply the radius times itself. Then times pi.

Q: How do you find the area if you know the radius?

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Radius = +sqrt(Area/pi)

The area of a circle equals pi times the radius squared (A = pi*radius2) where pi is 3.1416 So the radius is the square root of the area divided by 3.1416

Divide the area by pi. (3.14 or 22/7) Find the square root of your answer. This will be the radius. Multiply the raduis by 2.

The area of a circle is found by multiplying pi time the radius squared A = (pi) r2 So to find the radius, divide the area by pi and then take the square root to get the radius. The diameter is always exactly twice the radius. --- Example: Area = 100 A = (pi) r2 100 = (3.1416) r2 r2 is 100/3.1416 or about 31.83, and the square root is 5.64 r = 5.64 and D = 11.28

Since the area of a circle is (Pi)times(Radius squared) then you would reverse the process to find the radius, and hence, the diameter. Divide the area by Pi (3.14159...) and you would have the radius squared. Take the square root of that and you have the radius. To get the diameter, multiply the radius by 2.

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Radius = +sqrt(Area/pi)

Radius is the square root of (area divided by pi).

If you do not have the area, what do you have? The radius is half the diamiter The radius is PieR2 Worked backwards if you know the circumfrence.

Area of Circle = pi (radius)2 So , using this formula we can find the radius and also the diameter. Diameter = 2(radius)

Area of a circle = pi*radius2

well it is benificial to know the area of a shape because to find the circumference, radius, and diameter u must know the area of the shape well it is benificial to know the area of a shape because to find the circumference, radius, and diameter u must know the area of the shape

To find the circumference of a circle when you know the area, you first need to find the radius of the circle using the formula for the area (area = πr^2). Once you have the radius, you can calculate the circumference using the formula for the circumference (circumference = 2πr).

If you have the radius, then area = pi*r2 which you then round to the nearest hundredth. If you do not know the radius but do know the diameter or circumference, you can calculate the radius. Otherwise you need to measure it.

Area=πr2 π≈3.14 (π is pi)

It depends on the values you have. The base of a cylinder is a circle. If you know the circle's diameter, half it to find the radius. If you know the circle's circumference, divide by 2pi to find the radius. If you know the circle's area, divide by pi and take the square root to find the radius.

You can measure it. Otherwise, you certainly have to know SOMETHING about the circle to calculate the radius, usually the diameter, the circumference, or the area. If you don't know anything at all about a circle, you can't find out the radius, either.

Use the formula area = pi x radius2. If you replace everything you know, you can solve for the radius.