Question

A road which is $7$ m wide surrounds a circular park whose circumference is $352$ m. Find the area of road.

Answer 1

Circumference of circular park$=352m$

$2\pi r=352$

$2\times \frac{22}{7}\times r=352$

$r=\frac{32\times 7}{4}=8\times 7=56m$

$r_2=56+7=63m,r_1=56m$

Area$=\pi r_2^2-\pi r_1^2$

$=\pi ({63}^2-{56}^2)$

$=2616.947m^2$