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Area of a circle = pi multiplied by (radius squared)
Pi is approximately 3.141 so do r x r x 3.141

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Q: How do you ESTIMATE the area of a circle if you know its radius?
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When you know the radius of a circle how can you find the area?

Area of a circle = pi*radius2


Formula and result of area of circle?

The formula for the area of a circle is: Area = (pi) x (Radius)2 . When you know the radius of the circle and you use it to calculate the area of the circle, the result will be equal to (pi) x (Radius)2 .


What is the radius of circle with an area of 110?

Use the formula for the area of a circle (area = pi x radius squared), replace what you know (in this case the area), and replace - in this case - for the radius.


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 the circle if you know the area?

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


How do you find the radius if you know the area of a circle?

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


How do you find the area of a circle if you only know its circumference?

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


How do you find the radius and diameter of the circle if you know the area?

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


Formulas of area in a circle?

If you know the circle's Radius, the area is [ pi times r2 ]. If you know the circle's Diameter, the area is [ 1/4 pi D2 ].


What is the required piece of information tho find the area of a circle?

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).


Does the radius affect the area of a circle?

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.


How do you find the radius of a circle if you don't have the area?

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.