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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.
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How do you find the radius of a circle if you only know the area?
Radius = +sqrt(Area/pi)
How do you find the radius of a circle if you already know the area?
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
If the area is 628 what is the radius of a circle?
To find the radius of a circle with a given area of 628, you can use the formula for the area of a circle, A = πr^2, where A is the area and r is the radius. Rearranging the formula to solve for the radius, you get r = √(A/π). Substituting the given area of 628 into the formula, you get r = √(628/π) ≈ √(199.87) ≈ 14.14. Therefore, the radius of the circle is approximately 14.14 units.
How do you find the diameter of a circle when you know the area?
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.
How do you find the radius and diameter of a circle if you know the area?
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
