a)
[tex]V = 6cm \times 8cm \times 12cm = 48 {cm}^{2} \times 12cm = \underline{576 {cm}^{3} }[/tex]
b)
[tex]V = \frac{3dm \times 4dm}{2} \times 2dm = \frac{12 {dm}^{2} }{2} \times 2dm = 6 {dm}^{2} \times 2dm = \underline{ 12 {dm}^{3} }[/tex]
c)
[tex]V = \frac{(2m + 4m) \times 3m}{2} \times 1.5m = \frac{6m \times 3m}{2} \times 1.5m = \frac{18 {m}^{2} }{2} \times 1.5m = 9 {m}^{2} \times 1.5m = \underline{ 13.5 {m}^{3} }[/tex]
