Mathematics

Problem

A circle’s radius

r

increases at a constant rate of

3\text{ cm/s}

. When

r=10\text{ cm}

, what is the rate of change of the circle’s area? a)

120\pi\text{ cm}^2/\text{s}

30\pi\text{ cm}^2/\text{s}

60\pi\text{ cm}^2/\text{s}

300\pi\text{ cm}^2/\text{s}