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25 December, 16:27

A jewl case that holds 2 cds is 140mm x 120 mm x 9 mm what is the surface area of this jewl

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  1. 25 December, 16:47
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    The case will have 6 surfaces

    Top + Bottom Surface = 2 x 140 x 120 = 33600 square mm

    Right + Left Surface = 2 x 140 x 9 = 2520 square mm

    Front and Back Surface = 2 x 120 x 9 = 2160 square mm

    Total = 33600 + 2520 + 2160 = 38280 square mm
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