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12 September, 19:49

The surface area of a cube is 54 sq inches. A new cube has double the edge lengths of the first cube. What is the surface area of new cube?

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  1. 12 September, 22:06
    0
    216 sq inches

    Step-by-step explanation:

    Let initial surface area be given by l*w hence lw=54 square inches

    When the new cube has double edge lengths, new l is 2l and new w is 2w

    New area is 2l*2w=4lw

    If lw=54 square inches

    4lw=?

    New area=4lw*54/lw=216 square inches

    Therefore, the new surface area will be 216 square inches
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