Grade 7 - Mathematics 9.2 The Area of a Circular Path - II

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 m and width of the path = 3.5 m.
So, the radius of the outer ring = 60 + 3.5
= 63.5 m.
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 m.

Directions: Read the above example carefully and answer the following questions. Also write at least 10 examples of your own.