Question

the circumference of a circular field is 264m.a path 1.4m wide runs around it from inside find the cost of gravelling the path at RS.30per square metre.​

Answer 1

Answer:

Cost of gravelling = 10,902 Rs

Step-by-step explanation:

Circumference = 264 m

2πr = 264

2 x (22/7)x r = 264

        r = $\frac{264 X 7}{2 X 22}$  = 42 m

Outer radius r₁ = 42 m

Inner radius r₂ = 42 -1.4 = 40.6 m

Area to be gravelled = π (r₁² - r₂²)

                                  = (22/7) x (42² - 40.6²)

                                  = 22 x 82.6 x 1.4/7

                                  = 363.4 m²

Cost of gravelling = 363.4 x 30 = 10902 Rs