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Q: When you know the radius of a circle how can you find the area?

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Radius = +sqrt(Area/pi)

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

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

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.

Area of a circle equals pi r2 Therefore the radius of a circle equals the square root of (area divided by pi).

The only piece of information required to find the area of a circle is the radius of the circle. Once you know the radius of the circle, the area is simply the radius squared multiplied by pi (approximately 3.14).

Divide its circumference by 2*pi which will give the radius of the circle. Area of the circle then is pi*radius squared

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.

If you know the area, you can find the radius --> A = (pi) * r^2 If you have the radius, you can find the circumference --> C = (pi) * 2 * r

Find the circumference of a circle with radius 5 ft.Area of a circle. The area of a circle of radius r is given by the polynomial πr2. Use 3.14 as an approximation for π.

Yes the radius does affect the area of a circle. In fact to find the area of a circle people need to know the radius. The radius is half way between the middle of a circle to any of it's edges. The formula for the area of a circle ispi*radius squaredYou must first find the square of the radius and multiply it by pi(3.14.) For more help go to Wikipedia.com and type circle.

You already know the radius.

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