Test Academy | The radius of a circle is increasing at the rate of 0.4 cm/ s. The rate of increasing of its circumference is 0.4 π cm/s, 0.8 π cm/s, 0.8 cm/s, None of these

Question

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

Options :

0.4 π cm/s
0.8 π cm/s
0.8 cm/s
None of these

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