Question

Need help with surface area of a rectangular prism.
~ Example in the comments~
SA= 2lw + 2lh + 2wh

Answer 1

S = 2 (21 * 21) + 2(21 * 2) + 2(2 * 21)
S = 1050

Answer 2

Wait, how did you get 21?

Answer 3

In your equation you put 21h and 21w

Answer 4

Oh sorry, that was meant to be the equation to find surface are for a rectangular prism. SA=2 Length times width + 2 Length times height + 2 Width times Height.

Answer 5

Sorry, did not see that photo you attached

Answer 6

Here is the answer
S = 2 (12 * 4) + 2(12 * 2) + 2(4 * 2)
S = 160

Answer 7

That's fine. And thank you.