# How Do You Work Out the Area of a Circle?

The area of a circle can be defined as the number of square units within that circle, and the formula for calculating the area of a circle is A= ? .r .r. Where A is the area and r is the radius. Pie (?) represents the ratio of the circle's circumference to the diameter.
Ask.com Answer for: how do you work out the area of a circle
The formula for finding the area of a circle is A=(pi)R^2.
R is the radius of the circle.
The area of a circle is the number of square units inside that circle, if each square in the circle to the left has an area of 1cm2, you could count the total number of squares to get the area of this circle. However, it is easier to use one the following formulas; A=.r²or A=pi times r times r, where A is the area and r is the radius.
To get the area of a circle simply multiply pie and the square of the radius and you get the area of the circle
To work out the area of a circle, you need to measure its radius. Now, you have to multiply the square of radius with Pi, which equals to 3.14. To know more about working out the area of a circle, visit: http://www.mathgoodies.com/lessons/vol2/circle_area.html
The area enclosed by a circle is equal to that of a triangle whose base has the length of the circle's circumference and whose height equals the circle's radius. A circle's area comes to ???? multiplied by the radius squared. For more information, visit: http://www.ask.com/wiki/Circle?oo=0
Q&A Related to "How Do You Work Out the Area of a Circle"
 The area of a circle is calculated by the square of a radii times pi. Pi is 3.14159 approximately. To find the radius take the distance across the circle through the center and divide http://answers.ask.com/Science/Mathematics/how_to_...
 1. Decide what value of pi to use to find the area of the circle. Pi can extend to an infinite number of places after the decimal without repeating. Your calculation will be more http://www.ehow.com/how_5165674_area-circle.html
 1 Calculate the length of the radius. If you only know (or have measured) the diameter (the distance from one side of the circle to the other), then divide it by two to obtain the http://www.wikihow.com/Calculate-the-Area-of-a-Cir...
 To clarify, I think you mean that the circumference of a circle is the derivative of the area with respect to the radius. i.e. C = dA/dr. Here's how to conceptualize it: The derivative http://www.quora.com/Mathematics/Why-is-the-circum...
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