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The radius of a circle is increasing at the rate of 0.7 cm/s.

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asked Jan 20, 2018 in Mathematics by sforrest072 (157,439 points) ● 61 ● 410 ● 941
The radius of a circle is increasing at the rate of 0.7 cm/s. What is the rate of increase of its circumference?

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answered Jan 20, 2018 by mdsamim (213,225 points) ● 5 ● 10 ● 15
selected Jan 20, 2018 by sforrest072
 
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The circumference of a circle (C) with radius (r) is given by C = 2πr.

Therefore, the rate of change of circumference (C) with respect to time (t) is given by,

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