\(\displaystyle{\underset{{\bot{h}}}{{{V}}}}={\underset{{{1}}}{{{V}}}}+{\underset{{{2}}}{{{V}}}}\)

\(\displaystyle{V}={a}{b}{c}\)

Where a, b and c are the length, width and hight.

\(\displaystyle{\underset{{{1}}}{{{V}}}}={1}\times{2}\times{2}={4}{m}^{{3}}\)

\(\displaystyle{\underset{{{2}}}{{{V}}}}={1}{m}\times{2}{m}\times{4}{m}={8}{m}^{{3}}\)

\(\displaystyle{\underset{{\bot{h}}}{{{V}}}}={4}{m}^{{3}}+{8}{m}^{{3}}\)

\(\displaystyle={12}{m}^{{3}}\)

\(\displaystyle{V}={a}{b}{c}\)

Where a, b and c are the length, width and hight.

\(\displaystyle{\underset{{{1}}}{{{V}}}}={1}\times{2}\times{2}={4}{m}^{{3}}\)

\(\displaystyle{\underset{{{2}}}{{{V}}}}={1}{m}\times{2}{m}\times{4}{m}={8}{m}^{{3}}\)

\(\displaystyle{\underset{{\bot{h}}}{{{V}}}}={4}{m}^{{3}}+{8}{m}^{{3}}\)

\(\displaystyle={12}{m}^{{3}}\)