AM-1723

Maxima and minima problems

A Math · Secondary 4 · Hard · Maxima and minima problems

1. $S = \dfrac{5}{3}\pi r^2 + \dfrac{160\pi}{r}$
2. $S = 3\pi r^2 + \dfrac{160\pi}{r}$
3. $S = \dfrac{5}{3}\pi r^2 - \dfrac{160\pi}{r}$
4. $S = \dfrac{4}{3}\pi r^2 + \dfrac{80\pi}{r}$

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