Example:
The circumference of a circle is 30.8 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 = 30.8 cm.
A = (30.8)^{2}/4 * 7/22
A = 6640.48 / 88
A = 75.46 sq cm.
Therefore, the area of he circle (A) = 75.46 sq cm.
Directions: Read the above example carefully and answer the following questions. Also write at least 10 examples of your own.
