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linear system problems

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the base of an isosceles triangle is one third the lenght of each congruent sides the perimeter of the triangle is 84 cm how long is the base?

  • linear system problems - ,

    If the base is x
    each side is 3 x
    the perimeter is x + 3 x + 3 x = 7 x
    so
    7 x = 84
    x = 12

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