a perimiter is always the distance all the way round. So it will be 6+ 8+10 but do it in stages
6+8=14 now add the last piece 14+10=24 (6+8+10=24) it does not matter if it is feet or miles or mm.
Think of walking round the triangle. Hope that helps.
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The perimeter could be anything between 136 and 156 inches. We can't figure it out until we know the length of the third side, and that could be anything between 58 and 78 inches.
f(x) = 2x² f(x) = 136 → 2x² = 136 → x² = 68 → x = ±√68 As the positive value is required, x = √68 ≈ 8.246