Question

rectangular parallelopipid ​

Answer 1

Answer:

$volume \: of \: cube = {x}^3 \\ {x3 = }^{?} {?} \\ 728 = {9}^3 \\ \\ total \: surface \: area \: of \: cube = 4 {x}^{2} \\ 4 \times 9 \times 9 = 324 {cm}^{2} \\ diagnol \: of \: cube \: = \sqrt{3 \: } \times \: a \\ 9 \sqrt{3}$