# The radius of a circle is increasing at the rate of 0.7 cm/s. What is the rate of increase of its circumference

SHAIK AASIF AHAMED
8 years ago
Hello student,
given dr/dt=0.7 cm/s
Rate of increase of circumference=2$\pi$(dr/dt)
=2(0.7)$\pi$
=1.4$\pi$
Thanks and Regards
Shaik Aasif