How do we know the figure is a cube? All the edges have the same length, and the angles of one face are all right angles. If one face is a square, all the faces must contain right angles.

Step 1: Multiply the width x length.       \(5 \times 5 = 25\;{\rm{square\;inches}}\)

Step 2: Multiply: width x length x height.          \(25 \times 5 = 125\;{\rm{cubic\; inches}}\)

Answer: The volume of this cube is 125 cubic inches.