Question

A square water tank has its side equal to 40m, there are 4 semicircular flower beds grassy plots all around it.

Answer 1

Side of water tank = 40m

Grassy plot is semicircular with radius = side/2=40/2=20m=r

Area of grassy plot = 4(area od semicircular grassy plot with radius 20m)

= 4[1/2 x (area of circle with radius)]

= 4 x 1/2 x π(20)^2

= 2x20x20xπ=800π m^2.

Cost of turfing 1m^2 = Rs. 1.25

Total cost of turfing the grassy plot around tank

= 800π ×1.25

= 1000π

= 1000 × 3.14

= Rs. 3140.