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16 June, 19:56

What is the length of the diagonal of a cube of 4 inches

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  1. 16 June, 20:21
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    First find the length of the diagonal of a square of side 4 inches:

    d^2 = 4^2 + 4^2 = 2*4^2 = 32. Then the diagonal of the cube has length

    sqrt (32 + 4^2) = sqrt (32+16) = sqrt (48) = 4sqrt (3).
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