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10 March, 04:37

The base of a rectangluar prism is 5 meters by 3 meters. the height of the prism is 7 meters. the total surface area, except for one face, is 121 square meters. What are the dimesions of the missing face?

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  1. 10 March, 07:28
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    Total SA = top + bottom + 2 (short side) + 2 (long side)

    top = bottom = 5*3 = 15

    short side = 7*3 = 21

    long side = 7*5 = 35

    SA = 2 (15) + 2 (21) + 2 (35) = 30+42+70 = 142

    So 142 - 121 = 21, so the missing face is a short side of 7*3
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