Open tank of given volume: dimensions for the least surface area

1. A.
   side of square bottom = 40 cm, height = 10 cm.
2. B.
   side of square bottom = 20 cm, height = 10 cm.
3. C.
   side of square bottom = 10 cm, height = 40 cm.
4. D.
   side of square bottom = 5 cm, height = 160 cm.

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1. A.
   5 m, 5 m, 10 m
2. B.
   10 m, 10 m, 5 m
3. C.
   2 m, 2 m, 8 m
4. D.
   15 m, 15 m, 5 m

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1. A.
   side $= 20\text{ }cm$, height $= 10\text{ }cm$
2. B.
   side $= 10\text{ }cm$, height $= 20\text{ }cm$
3. C.
   side $= 10\text{ }cm$, height $= 40\text{ }cm$
4. D.
   side $= 20\text{ }cm$, height $= 05\text{ }cm$

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1. A.
   $75\pi$
2. B.
   $50\pi$
3. C.
   $25\pi$
4. D.
   $125\pi$

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