51.

Describe how the two figures at the right are alike and how they are different. Which box has larger surface area?

Similarity:  Both have the same height.
Difference : Cylinder has curved and circular surfaces.
               Cube : All faces are identical squares.
Lateral surface area of the cylinder = 
                                                       = 
                                                       =
                                                        
Lateral surface area of the cube = 4l²
                                                   = 4 x (7 x 7) cm²
                                                   = 4 x 49 cm²
                                                   = 196 cm²
Obviously the cubical box has larger surface area.