Question

A circular park has a path of uniform width around it. The difference between outer and inner circumference of the circular path is $132m$. Its width is _____ $(\pi =\frac{22}{7})$

• A. $22m$
• B. $20m$
• C. $21m$
• D. $24m$

Answer 1

The correct option is C $21m$

Given $2\pi r_2-2\pi r_1=132$
$\Rightarrow r_2-r_1=\frac{132}{2\pi }=\frac{132\times 7}{44}=21m$