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What is the approximate surface area of the prism?

What is the approximate surface area of the prism?-example-1

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SA = 2 BA + LA

BA = TA = (10*8,7/2) = 43,5 cm²

LA = 3 FA = 3*15*10 = 450 cm²

SA = 2*43,5 + 450

SA = 87 + 450

SA = 537 cm²
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