Example:
The circumference of a circle is 56.6 cm. Find its area.
Solution:
If r is the radius of a circle, we have
Circumference (C) = 2pr
Therefore, the area of the circle = p
r^{2}
A = p(C/2p)^{2}
A = C^{2} / 4p
Given that,
C = 56.5cm.
A = (56.5)^{2}/4 * 7/22
A = 22345.75/ 88
A = 253.93 Sq. cm.
Therefore, the area of he circle (A) = 253.93 Sq. cm. (Answer is corrected by two decimal place)
Directions: Solve the following problems and correct the answer two decimal places. Also write at least ten examples of your own.
