Chris says that he can find the surface area faster by thinking of the box as a triangular prism on top of a
rectangular prism. He finds the surface area of each one
and adds them together. Does his method make sense?

38+105= 143, 39+104=143, and you will find then adding the numbers on opposite sides, moving inwards yields the answer 138 every time. because of this, you’re going to multiply 138 times the number of pairs, which is 34. therefore, 34*138= 4692(i’m sorry if it’s the wrong numbers, but it’s the right concept)