Question

What is the surface area of this design

Answer 1

The formula is 2LW + 2LH + 2WH
2*10*6+2*10*6+2*6*6 = 312 in^2

Answer 2

There are 4 faces with dimensions 10*6 and 2 with 6*6 so the equation would be:
4(10*6)+2(6*6)
4*60+2*36
240+72
312

Hope this helps :)