Question

A path $7$ meters wide surrounds a circular lawn $252$ m in diameter. Find the area of path.

Answer 1

Radius of the circular lawn
$=\frac{1}{2}\times 252m$
=126m
External radius of the path
=(126+7)m
=133m
Area of the path where,
R=133,r=126
$=\pi (R+r)(R-r)m^2$
$=\frac{22}{7}\times (133+126)\times (133-126)m^2$
$=\frac{22}{7}\times 259\times 7m^2$
$=5698m^2$