Question

The area of a circular play ground is 22176 cm². Find the cost of fencing this ground at the rate of 50 per metre.

Answer 1

Area of a circular play ground = 22176 cm²

i.e., πr² = 22176 cm²

⇒ `r^2 = 22176 xx 7/22` 

⇒ r² = 7056 

⇒ r = 84 cm = 0.84 m

Cost of fencing this ground = ₹ 50 × 2πr

= `₹ 50 xx 2 xx 22/7 xx 0.84`

= ₹ 264