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The radius of a circle is increasing at the rate of 0.4 cm/s. The rate of increase of its circumference is

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The radius of a circle is increasing at the rate of 0.4 cm/s. The rate of increase of its circumference is 

(a) 0.4 π cm/s 

(b) 0.8 π cm/s 

(c) 0.8 cm/s 

(d) None of these

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1 Answer

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edited by

Answer is (b) 0.8 π cm/s

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