Related rates: A stone dropped into a still pond sends out a circular ripple whose radius increases at a constant rate of 2.6 ft/s.?

A stone dropped into a still pond sends out a circular ripple whose radius increases at a constant rate of 2.6 ft/s. (a) How rapidly is the area enclosed by the ripple increasing when the radius is 5 feet? The area is increasing at _____ ft^2 /s. (b) How rapidly is the area enclosed by the ripple increasing at... show more A stone dropped into a still pond sends out a circular ripple whose radius increases at a constant rate of 2.6 ft/s.

(a) How rapidly is the area enclosed by the ripple increasing when the radius is 5 feet?

The area is increasing at _____ ft^2 /s.

(b) How rapidly is the area enclosed by the ripple increasing at the end of 8.2 seconds?

The area is increasing at _____ ft^2 /s.
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