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OpenStudy (anonymous):
The surface area of a rectangular prism is 150 cm². If all the sides are tripled, what will the new surface area be?
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OpenStudy (sumeer):
the area can be written as 2ab+2ac+2bc=150, the the new area will be 2.3.a.3.b+2.3.a.b+2.3b.3.c=9(2ab+2ac+2bc) => 9*150=1350
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