Question

What will be the cost for surfing a square water tank with sides 20 m surrounded by four semi-circular grassy plots, given that cost for surfing per m² is Rs.2.5?

• A. 1570
• B. 2000
• C. 3140
• D. 840

Answer 1

The correct option is A

1570

Side of square = Diameter of the semicircular plots

Area of 4 semicircular plots = 4 x $\frac{\pi d^2}{8}$ = 200$\pi$ = 628 $m^2$ [d = 20 m]

∴ Total cost of surfing the plot = Rs 2.5 x 628 = Rs 1570.