Question

8. Find the number of coins 1.5 cm in diameter and
0.2 cm thick to be melted to form a right circular
cylinder of height 16 cm and diameter 6 cm.​

Answer 1

FINAL ANSWER:

4800 coins

GIVEN:

coins 1.5 cm in diameter = r2=0.75 cm

0.2 cm thick =h2=0.2 cm

cylinder of height 16 h1= 16 cm

diameter 6 cm r1= 3 cm

TO FIND:

Find the number of coins could be formed

FORMULA USED:

$\frac{pi*r1^{2}*h1}{pi*r2^{2}*h2}$

SOLUTION:

∴ number to coins can be made = $\frac{pi*r1^{2}*h1}{pi*r2^{2}*h2}$

=$\frac{pi*3^{2}*16}{pi*0.2^{2}*0.75}$    [∵ pi π cancels with π]

=$\frac{3^{2}*16}{0.2^{2}*0.75}$

=$\frac{9*16}{0.04*0.75}$

=$\frac{144}{0.03}$

=4800 coins

Answer 2

mainhununknown ne sahi answer diya hai toh use brainlist bana do