Mathematics, 02.12.2021 16:00, lilfofo9

Jalani is given a task to select a piece of rectangular aluminium with a perimeter of 21 cm so that he can build an open cylinder by joining the two ends. Find
the piece of aluminium with correct length and width, in cm, that makes the
volume of the cylinder maximum.
A. Length = 3.5 cm, width = 7 cm
B. Length = 7 cm, width = 3.5 cm
C. Length = 4 cm width = 8 cm
D. Length = 8 cm, width = 4 cm

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Jalani is given a task to select a piece of rectangular aluminium with a perimeter of 21 cm so tha...