Question

A square water tank has its sides equal to 40 m.There are four semi-circular grassy plots all round it. Find the cost of turfing the plots at the rate of ₹ 1.25 per sq.m

Answer 1

Step-by-step explanation:

diameter of semi-circlular plot = 40m

radius = 20m

area of 1 semi circular plot = pi × r²

                                            = 3.14× (20)²

                                            = 3.14 × 400

                                            = 1256 m²

area of four semi circular plots = 1256 × 4 = 5024 m²

cost of turfing 4 semi circular plots = 5024×1.25 = ₹6280

Answer 2

Answer:

Sides of water tank =40 m

Radius=40/2 =20m =r

Area of grass plot =4×1/2×3.14×20×20

=800×3.14

=2512 m2

cost of turfing = Rs 1.25

Cost of turfing for 2512m = 2512×1.25

= Rs 3140