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

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

Mathematics
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S = 2 (21 * 21) + 2(21 * 2) + 2(2 * 21) S = 1050
Wait, how did you get 21?

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Other answers:

In your equation you put 21h and 21w
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.
Sorry, did not see that photo you attached
Here is the answer S = 2 (12 * 4) + 2(12 * 2) + 2(4 * 2) S = 160
That's fine. And thank you.

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