Q9 of 68 Page 15

A square water tank has its side equal to 40m. There are four semi-circular grassy plots all round it. Find the cost of surfing the plot at Rs.1.25 per square meter.


Side of water tank = 40m


Side of semi circular grassy plots =


Area of one grassy plot =



Area of grassy plots = 4×200π = 800π


Area of grassy plots = 800 × 3.14 = 2512 cm2


Cost of surfing 1m2 plot = 1.25 Rs


Cost of surfing 2512m2 = 2512 × 1.25 = 3140 Rs


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