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what is the surface area of a rectangular prim 3mm,9mm 13mm
Ok so the formula is SA = 2(l)(w) + 2(l)(h) + 2(w)(h). Plug the numbers in. SA = 2(3)(9) + 2(3)(13) + 2(9)(13). Multiply the numbers; 2·3·9=54. 2·13·3=78. 2·9·13=234. Now you have SA= 54 + 78 + 234. Add them together and SA= 366mm²
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