Problem

Find the surface area of the rectangular prism.

Answer

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Answer

Sum the doubled areas: 2A1+2A2+2A3

Steps

Step 1 ：Find the areas of each face: A1=l∗w, A2=l∗h, A3=w∗h

Step 2 ：Double the areas of each face: 2A1, 2A2, 2A3

Step 3 ：Sum the doubled areas: 2A1+2A2+2A3

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