Question

Find the number of coin. each of which are 1.5cm in diameter and 0.2cm thick. required to form a right circular cylinder of height 10cm and diameter 4.5cm.​

Answer 1

Answer:

451 coins is you answer

Answer 2

Answer:

As the coins are in the form of thin cylinder

Volume of each coin = π×(0.75)²×0.2

=0.1125π cm³

Volume of melted cylinder = π× (2.25)²× 10 = 50.625π cm³

number of coin required = (volume of melted cylinder)/(volume of each coin)

= 50.625π/0.1125π

= 450 coins