A manufacturer can save money by making a can that maximizes volume and minimizes the amount of metal used

Question

A manufacturer can save money by making a can that maximizes volume and minimizes the amount of metal used. For a can with radius r and height​ h, this goal is reached when 2πr3=πr2h. Answer parts a and b below

a. Solve the equation for h

Answer 1

2πr³=πr²h

2πr³ / πr² = h

2r = h

Not too hard.