MHT CET 2025 Mathematics question
By dropping a stone in a quiet lake, a wave in the form of circle is generated. The radius of the circular wave increases at the rate of 2.1 cm/sec. Then the rate of increase of the enclosed circular region, when the radius of the circular wave is 10 cm, is (Given )
Answer: (C)
Solution
Area , so . With cm, cm/s and :
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