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26 September, 17:08

The width of a rectangle is 15 cm less than the length. the perimeter is 78 cm. find the rectangle's dimensions

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  1. 26 September, 19:37
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    Length (L) : L

    width (w) : L - 15

    Perimeter (P) = 2L + 2w

    78 = 2 (L) + 2 (L - 15)

    78 = 2L + 2L - 30

    78 = 4L - 30

    108 = 4L

    27 = L

    width (w) : L - 15 = 27 - 15 = 12

    Answer: width = 12 cm, length = 27 cm
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