Question

A circular park, 42 m in diameter, has a path 3.5 m wide running round it on the outside. Find the cost
of gravelling the path at Rs 4 per m².​

Answer 1

Internal Radius = 21 m, External Radius =21+3.5=24.5 m

Area of path = π(24.5)

2

−π(21)

2

⇒π[(24.5)

2

−(21)

2

]

=500.5

Cost of travelling =500.5×4=Rs.2002