In a certain triangle, the longest side is 1 foot longer than the second longest side, and the secondlongest side is 1 foot longer than the shortest side. If the perimeter is 21 feet, how many feet long is the shortest side? x = shortest side x + 1 = secondlongest side {secondlongest side is 1 ft longer than shortest side} x + 2 = longest side {longestside is 1 ft longer than secondlongest side} Perimeter is the distance around the outside of an object. x + x + 1 + x + 2 = 21 {added up all sides and set equal to 21} 3x + 3 = 21 {combined like terms} 3x = 18 {subtracted 3 from each side} x = 6 {divided each side by 3} 6 ft is the shortest side  Algebra House
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