Question

4. Find the number of coins. 15 cm in diameter and 0.2 cm thick, to be melted to forn
right circular cylinder with a height of 10 cm and a diameter of 4.5 cm
Pin​

Answer 1

Answer:

9th

Maths

Surface Areas and Volumes

Volume of Cube, Cuboid and Cylinder

The numbers of coins of 1.5...

MATHS

The numbers of coins of 1.5 cm in diameter and 0.2 cm thick, to be melted to form a right circular cylinder of height 10 cm and diameter 4.5 cm is:

MEDIUM

Share

Study later

ANSWER

Let n be the number of 1.5 cm diameter coins required to form a right circular cylinder of height 10 cm and diameter 4.5 cm.

Now,

Volume of right circular cylinder =n× volume of 1.5 cm diameter coin.

Therefore,

n=

π(

2

1.5

)

2

×

10

2

π(

2

4.5

)

2

×10

=

20×20

45×45

×

15×15×2

10×20×20×10

=9×10×5

=450