Answer:
A has the largest surface area.
Step-by-step explanation:
Surface Area of A = 2(10*3.5) + 2(10*4) + 2(4*3.5)
= 70 + 80 + 28
= 178 in^2.
For B:
Area = 2(12*3.2) + 2(12*2.8) + 2(2.8*3.2)
= 76.8 + 67.2 + 17.92
= 161.92 in^2.
I'll draw it for you cause im nice.
Ok so if you have 5ft on a square, all the sides are 5ft.
That mean that if its in half, one of the sides will be 2.5ft.
Now you can add 2.5 + 2.5 + 5+5 = 15.
So its 15 ft.
To get the answer of 7,280 all i can figure out is to multiply (X) 364 x 20 = 7,280 and that gives you the answer you show of 7,280.