Question #1
So, when finding the full size of this, we would first want to basically multiply everything. When you find the "area", this would signify that we would then find the total of everything of the size in the box.
[tex]\boxed{\boxed{31*13*28}} = \ \boxed{\boxed{\bf{11284cm^2}}}[/tex]
Question #1 (part 2)
So, sense this would be considered to be a 4 sided shape as mentioned in the question, we would then divide the total of the area, and then divide this by 4.
Your answer: 2821