The number of coins, each of radius 0.75 cm and thickness 0.2 cm, to be melted to make a right circular cylinder of height 8 cm and radius 3 cm, is

• Volume of one coin is = 3.14 * (0.75*0.75)*0.2
  Volume of the cylinder = 3.14*(3*3)*8
  Volume of cylinder = Number of coin * Volume of one coin.
  Number of coin = Volume of cylinder / Volume of one coin
  Number of coin =3.14*(3*3)*8 / 3.14 * (0.75*0.75)*0.2 = 640 Ans
• 8 years agoHelpfull: Yes(1) No(0)
• coin is also a cylinder, so
  n(3.14*r1^2*h1)=3.14*r2^2*h2
  r1=.75
  h1=.2
  r2=3
  h2=8
  n=64
• 11 years agoHelpfull: Yes(0) No(0)