Find the length of one of the edges of a rectangular parallelepiped, the volume of which is 56 cm3, the base area is 28 cm2.

The volume of a rectangular parallelepiped can be found using the following formula.
V = a × b × c.
That is, the length is multiplied by the width and by the height.
We find the area as follows.
S = a × b.
That is, we multiply the length by the width.
Then the volume can be found as follows.
V = S × c.
We find c, since c is the length of the edge.
c = V / S.
c 56 cm ^ 3/28 cm ^ 2 = 2 cm.
This means that the length of the rib is 2 cm.
Answer: 2 cm.