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17 January, 08:52

A rectangle is 3 times as long as it is wide, and its perimeter is 80 centimeters. Find its dimensions

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  1. 17 January, 10:35
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    Say the width is W and the length is L

    L=3W (and of course W=W)

    Now you use the perimeter formula P=2L+2W

    80=2 (3W) + 2W)

    80=6W+2W

    80=8W Divide both sides by 8

    W=10

    Now that you know the width, substitute it back into L=3W to find the length

    L=3 (10)

    L=30

    The dimensions are length: 30 cm and width: 10 cm
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