A gear 12 cm in diameter is turning a gear 18cm in diameter . When the smaller gear has 42 revolutions , How many revolutions has the larger one made?
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Answer:
28
Step-by-step explanation:
2πr ✖42
84π ✖12/2 = 504π
No. of revolution by big gear
= 504π/2π ✖9 = 28.
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