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11 January, 22:24

The perimeter of a triangle is 84. The longest side is 7 meters less than twice the length of the shortest side, x. The middle side is 7 meters longer than the shortest side. What is the length of each side?

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  1. 12 January, 00:30
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    Perimeter = Side + Side + Side

    Side 1 = x

    Side 2 = x + 7

    Side 3 = 2x-7

    Plug into the equation:

    84 = x + (x + 7) + (2x-7)

    84 = x + x + 7 + 2x - 7

    Combine like terms:

    84 = 4x

    Divide by 4 and solve for x:

    21 = x

    Side 1 = 21

    Side 2 = 28

    21+7=28

    Side 3 = 35

    21 (2) - 7 = 42 - 7 = 35
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