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6 November, 21:00

Find the area of a square with a diagonal of 4cm.

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  1. 6 November, 21:21
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    Let the side length be s. Then sqrt (s^2+s^2) is the length of the diagonal.

    sqrt (2s^2) = 4 cm, so 2s^2 = 16 cm, and s^2 = 8, so that s = 2sqrt (2).

    The area of this square is s^2, which here is 4 (2), or 8 square units (answer)
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