Open box from a sheet by cutting corner squares: maximum volume

1. A.
   $\frac{a + b - \sqrt{a^{2} + b^{2} - ab}}{12}$
2. B.
   $\frac{a + b - \sqrt{a^{2} + b^{2} + ab}}{6}$
3. C.
   $\frac{a + b - \sqrt{a^{2} + b^{2} - ab}}{6}$
4. D.
   $\frac{a + b + \sqrt{a^{2} + b^{2} - ab}}{6}$

Tap an option to check your answer.

1. A.
   675
2. B.
   1025
3. C.
   800
4. D.
   900

Tap an option to check your answer.