Question

A square tank has an area of 1600 m2.There are four semicircular plots around it.What is the cost of turfing the plots at Rs. 1.25 per m2.

Answer 1

Area of square = 1600 m²
length of side, l = √1600 = 40m
so diameter of semicircles = length of side of square = 40m
radius, r = 40/2 = 20m
Area of one semicircle = $\frac{ \pi r^2}{2} = \frac{22*20^2}{7*2} =628.57\ m^2$

Area of all 4 semicircles = 4×628.57 = 2514.28 m²

total area = 2514.28+1600 = 4114.28
rate = Rs. 1.25 per m²
total cost = 1.25×4114.28 = Rs. 5142.85

Answer 2

Answer :- Cost of turfing the plots is Rs. 3140.