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Q: How do you find the radius of a circle when the area is given?

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If yo have the area of the circle, the square is irrelevant. Radius = sqrt(Area/pi)

If 'R' is the radius of the circle, then-- area of the circle is [ pi R2]-- perimeter of the circle is [ 2 pi R ]

112cm2

The radius of a circle is the distance from the center to any point on the circle. The area is the space within the circle. The formula to find the area is πr2. r stands for the radius of the circle. If you want to find the radius, you can work backwards from the area or the circumference, which is the perimeter of the circle. The formula for circumference is 2πr.

Circumference of a circle = 2*pi*radius or diameter*pi Area of a circle = pi*radius squared

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If yo have the area of the circle, the square is irrelevant. Radius = sqrt(Area/pi)

The answer depends on what information you are given.

Divide the area by pi and then square root it this will give the radius of the circle.

By using the other information supplied about the circle to calculate either its radius (from which its area can be calculated) or its area (if the circle is similar to another with a given area and some ratio between the two circle is given):If the diameter is given: radius = diameter ÷ 2If the circumference is given: radius = circumference ÷ 2πIf the circle is similar to another circle which has a given area, and the length ratio is given; square the length ratio to get the area ratio and apply to the given area.

Area = pi*radius2 So, radius = sqrt(area/pi)

a=area p=pi r=radius sqr(a/p)=r

Half the square root of the square radius equals the circle radius.

If the circumference or diameter is given then you can find the radius or simply measure the distance from the centre of the circle to the circumference.

A = pi x radius2

A = pi x radius squared where pi = 3.14

If 'R' is the radius of the circle, then-- area of the circle is [ pi R2]-- perimeter of the circle is [ 2 pi R ]

Area of a circle = pi x radius squared, so to get the radius, divide the Area by pi (3.14159), and then find the square root of that

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