Question

A pond $100m$ in diameter is surrounded by a circular grass walk $2m$ wide. How many square meters of grass is there on the walk?

• A. $98\pi$
• B. $100\pi$
• C. $204\pi$
• D. $202\pi$

Answer 1

Answer: (C)

$204\pi$

Let pond radius $=50m$

Then, radius of pond + walk $=52m$

Then, the area of walk is

$\pi \times ({52}^2-{50}^2)$

$=204\pi$