coin or cylinder!!?
Geometry
Level
pending
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
640
500
460
600
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1 solution
V = (pi)(r^2)(h)
Let x = the number of coins required
x (pi)(r^2)(h) = (pi)(r^2)(h) x = (3cm^2 * 8cm) / (0.75cm^2 * 0.2cm) x = 640