The area of a circle is determined by the formula: A = π r^{2}. You can easily calculate the area of a circle in under a minute. All you need is a calculator, a circle to measure and a tool with which to measure, such as a ruler.
Know MoreUse a ruler or similar tool to measure the radius of the circle. This is the length of the line from the middle of the circle to any point on its edge.
If the radius of the circle was measured in inches, multiply the number by 0.0833333 using the calculator. If it was measured in centimeters, multiply the number by 0.0328084.
Multiply the radius (in feet) by itself. Then multiply this number by pi (approximately 3.141592). There should be a pi (π) button on your calculator to make this easier. This number is the area of the circle in square feet.
The area of any simple shape, such as a circle, triangle or rectangle, can be found by taking a series of measurements from the shape and plugging them into a formula. The necessary formula varies according to the shape but works for all shapes of that type.
Full Answer >The equation for the area of a circle is pi times the square of the radius or A = πr^{2}. Calculating the area of a sector involves figuring out what fraction of the circle's area the sector covers.
Full Answer >The formula for the circumference of a circle is 2(pi)r. R stands for the radius of the circle, which can also be found by taking the diameter and dividing it by 2, and pi can be approximated by the decimal 3.14.
Full Answer >The diameter of a circle can be calculated using the formula d = 2r, where "d" indicates the diameter and "r" denotes the radius of the circle. In terms of circumference, the diameter can be computed using the equation d = c/pi, where "c" represents the circumference and pi is approximately equivalent to 3.142. If the area of the circle is given, the formula d = sqrt (4a/pi) can also be used to solve for the diameter, where "a" denotes the area.
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