Example:
The radius of a circular path of garden is 60 metres. A circular path of width 3.5 metres is laid around and outside the garden. Find its area.

Solution:
We have given that,
r = 60 metres and width of the path = 3.5 metres.
So, the radius of the outer ring = 60 + 3.5
= 63.5 metres
Hence the area of the path = p (R+r)(R-r)
= 22/7 * (63.5 + 60)(3.5)
= 22/7 * 123.5 * 3.5
= 1358.5 Sq. mt.

Directions: Solve the following problems. Also write at least ten examples of your own.