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4 September, 16:11

The length of a rectangle is double it's width. If the perimeter is 54cm, what is it's length?

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  1. 4 September, 18:09
    0
    length is 18

    Step-by-step explanation:

    set up a system of equations

    use substitution

    54 = 2l + 2w

    l = 2w

    54 = 2 (2w) + 2w

    54 = 6w

    w = 9

    l = 2 * 9 = 18
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