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Practice mode Volume and Surface Area

A solid metal cylinder of radius 4.5 cm and height 10 cm is melted to make coins of radius 0.75 cm and thickness 0.2 cm. How many coins are obtained?

Correct answer B. 1,800

Explanation

Coins = (4.5² x 10) / (0.75² x 0.2) = 202.5 / 0.1125 = 1800. The π cancels on both sides.

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