1. The problem statement, all variables and given/known data A stone dropped into a still pond sends out a circular ripple whose radius increases at a constant rate of 3 ft/s. Does the area also increase at a constant rate? 2. Relevant equations A = ∏r2 3. The attempt at a solution dA/dt = 2∏r(dr/dt) dA/dt = 2∏r(3ft/s) What now?