Rate of change of cross-section of cylinder I got this task on my calculus class and I got stuck at process of figuring it out A clay cylinder is being compressed so that its height is changing at the rate of 4 millimeters per second, and its diameter is increasing at the rate of 2 millimeters per second. Find the rate of change of the area of the horizontal cross-section of the cylinder when its height is 1 centimeter. What I know: Volume is unknown and constant Rate of change of diameter is dD/dt=0,2cm/sec

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