The formula for volume always involves three dimensions.
In this case, the volume of a cube is
, where
is the side length of the cube.
To solve for that side length, you'd need to use a cube root.
78 units squared add together 27.5+12+22+16.5 and you’ll get your answer for triangles it’s 1/2bh and for the rectangles it’s just bh. hope this helped!