This stack exchange question says that the optimal cylinder is one with a height twice the radius, not diameter https://math.stackexchange.com/questions/144956

This stack exchange question says that the optimal cylinder is one with a height twice the radius, not diameter https://math.stackexchange.com/questions/1449563/height-radius-ratio-for-maximum-volume-cylinder-of-given-surface-area https://math.stackexchange.com/questions/1449563/height-radi...