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9 August, 12:38

The perimeter of a rectangle is 42cm and its diagonal is 15cm. Find the dimension of the rectangle

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  1. 9 August, 12:44
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    P=2 * (L+l) = 42

    L+l=42:2

    L+l=21

    (L+l) ^2=441

    use the formula (a+b) ^2=a^2+b^2+2ab

    (L^2+l^2) + 2l*L=441

    D = V L^2+l^2 = 15

    L^2+l^2=225

    225+2l*L=441

    2l*L=441-225=216

    l*L=216:2

    A=108
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