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Find 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 base radius 3 cm.



By. πr2h. 3×3×8=n×.75×.75×.2. 72=n×0.1125. So n= 640
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Coin, r=0.75cm h=0.2cm V=pi r^2h =22/7*0.75*0.75*0.2 =2.475/7cm^3 Cylinder, h=8 cm r=3cm V= 22/7*3*3*8 =1584/7 cm^3 No. of coins=1584/7*7/2.475 =640
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