The diameters of two circular coins are in the ratio of 1: 3. The smaller coin is, made to roll around the
The diameters of two circular coins are in the ratio of 1: 3. The smaller coin is, made to roll around the bigger coin till it returns to the position from where the, process of rolling started. How many times the smaller coin rolled around the bigger coin?
(a) 9 (b) 6 (c) 3 (d) 1.5
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(c) Perimeter of bigger coin : Perimeter of smaller coin
= 2π(3) : 2π(1) = 3 : 1
Hence, smaller coin will roll 3 times around the bigger coin.
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