Question

A square water tank has its each side equal to 40 m.There are four semi circular grassy plots all around it. Find the cost of turfing the plot at ₹ 1.25 per sq. m.(use π=3.14).

Answer 1

SOLUTION:

GIVEN:
Side of a Square water tank = 40 m
Radius of a semicircular plot = Side of a Square/2 = 40 /2 = 20 cm

Area of 1 semi circular grassy plot = πr²/2
=( π × 20²) /2 = 400π/2 = 200π cm²
Area of 4 semi circular grassy plots = 4 × 200 π = 800 π cm²

Rate of turfing the plot = ₹ 1.25 per square metre

Cost of turfing the plot = Area of 4 semi circular grassy plots  × Rate of turfing the plot
Cost of turfing the plot = 800 π × 1.25 = 800 × 3.14 × 1.25 = 2512 × 1.25 = ₹ 3140

[π= 3.14 (Given)]

Hence, the Cost of turfing the plot is  ₹ 3140

HOPE THIS WILL HELP YOU...

Answer 2

plz refer to the attachment ↑↑↑

hope this helps..!!