This relationship is expressed in the following formula. This is a great starting point. We suggest to use the same formula to find the area of a circle which uses radius in it.
Estimate of Circles Area 80 of Squares Area 80 of 9 72 m2 Circles True Area p 4 D 2 p 4 3 2 707 m2 to 2 decimals The estimate of 72 m2 is not far off 707 m2 A Real World Example.
One method of deriving this formula which originated with Archimedes involves viewing the circle as the limit of a sequence of regular polygons. Notice that the calculated area of the circle is same in both the methods. The formula to find a circles area p radius 2 usually expressed as p r 2 where r is the radius of a circle. The radius of the circle is the length of a straight line stretching from the center of the circle to the line of circumference.