Circumference of a Circle. Area of A a 2 20m 20m 400m 2. To find the area using the radius or the length from the center of the circle to the edge use the formula area pr2 where r is the radius.
Area of A a 2 20m 20m 400m 2.
Area of B ½b h ½ 20m 14m 140m 2. To calculate the area of a circle you can use the PI function together with the exponent operator. Area p x r 2 in terms of radius r. The radius of the circle is the length of a straight line stretching from the center of the circle to the line of circumference.