If by dropping a stone in a quiet lake a...

If by dropping a stone in a quiet lake a wave moves in circle at a speed of 3.5 cm/sec, then the rate of increase of the enclosed circular region when the radius of the circular wave is 10 cm, is `(pi=(22)/7)` `220s qdotc m//s e c` b. `110s qdotc m//s e c` c. `35 s qdotc m//s e c` d. `350s qdotc m//s e c`

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