The figure is obtained by stacking together two rectangular prisms.
The large one, on the left, has dimensions 7,3 and 3 cm.
The small one, on the right, has dimensions 1, 3 and 3.
The volume of a rectangular prism is given by the product of its dimensions, so the two volumes are
[tex] V_1 = 7\times 3\times 3 = 63,\quad V_2 = 1\times 3\times 3 = 9 [/tex]
Since the two rectangular prisms don't intersect, the volume of the whole figure is simply the sum of the two volumes:
[tex] V_{\text{tot}} = 63+9 = 72 [/tex]
