Question

A circle has an initial radius of 50 ft when the radius begins decreasing at the rate of 2 ​ft/min. What is the rate in the change of area at the instant that the radius is 17 ​ft?

Answer 1

the rate in the change of area at the instant that the radius is 17 ​ft ≈ 214ft²/min

Explanation:

the working is shown in the attachment