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In order to find the diameter of a circle if you have the area is to rearrange the formula for the area of a circle to put diameter as the unknown, like so:

PIE*d = Area of a Circle

d = (Area of a Circle) / PIE

Therefore if the area of your circle is 40cm, 40/PIE = 12.73cm and that's the diameter.

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โˆ™ 2011-09-13 01:45:09
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Q: How do you find the diamter of a circle if you know the area?
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When you know the radius of a circle how can you find the area?

Area of a circle = pi*radius2


How do you work out the difference of the area of a circle and the area of a square when the radius of the circle is 6cm and the side of length of the square is 12cm?

Do you know how to find the area of a circle when you know the radius ? Good! Do that. Do you know how to find the area of a square when you know the length of the side ? Good! Do that. Now you have two numbers ... the area of the circle and the area of the square. The problem wants you to find the difference of these two numbers. Do you know how to use subtraction to find the difference of two numbers ? Good! Do that.


How do you find the area of a semi-circle if you know the diameter?

A semicircle is 1/2 of a circle. Find the area with the diameter you are given as if you had a whole circle, then divide that answer by 2 to get the area of the semicircle.


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Divide the perimiter, or circumference, by pi (3.1415), which is the diamter, then divide that by 2 to get the radius


How do you find the diameter of a circle in the terms of pi?

To find the diameter of a circle, you will either need to know the area or its circumference. If you know the area: diameter = 2 x squareroot(area / Pi) If you know the circumference diameter = circumference / Pi


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


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Radius = +sqrt(Area/pi)


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Knowing the area of a circle which is pi times radius squared will help you to find other properties of the circle


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


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).


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