the number of coins , each of radius 0.75 cm and thickness 0.2cm, to be melted to make a right circular cylinder of height 8 cm and base radius 3 cm is
the number of coins , each of radius 0.75 cm and thickness 0.2cm, to be melted to make a right circular cylinder of height 8 cm and base radius 3 cm is
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#n (πr^2h) = πR^2H
#n = (3)^2 * 8 / (0.75^2 * 0.2)
#n = 72/0.1125
#n = 640