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Which of the following sets of numbers could represent the three sides of a triangle?

{10,13,22}

{14,26,42}

{6,14,22}

{15,18,34}

Which of the following sets of numbers could represent the three sides of a triangle?\newline{10,13,22} \{10,13,22\} \newline{14,26,42} \{14,26,42\} \newline{6,14,22} \{6,14,22\} \newline{15,18,34} \{15,18,34\}

Full solution

Q. Which of the following sets of numbers could represent the three sides of a triangle?\newline{10,13,22} \{10,13,22\} \newline{14,26,42} \{14,26,42\} \newline{6,14,22} \{6,14,22\} \newline{15,18,34} \{15,18,34\}
  1. Recall Triangle Inequality Theorem: Recall the Triangle Inequality Theorem which states that the sum of the lengths of any two sides of a triangle must be greater than the length of the third side.
  2. Apply Theorem to Set {10,13,22}\{10,13,22\}: Apply the Triangle Inequality Theorem to the first set {10,13,22}\{10,13,22\}.\newlineCheck if 10 + 13 > 22, 10 + 22 > 13, and 13 + 22 > 10.\newlineCalculation: 10+13=2310 + 13 = 23, 10+22=3210 + 22 = 32, 13+22=3513 + 22 = 35.\newline23 > 22 (True), 32 > 13 (True), but {10,13,22}\{10,13,22\}00 (True).\newlineHowever, the first condition 10 + 13 > 22 is not satisfied, so this set cannot represent the sides of a triangle.
  3. Apply Theorem to Set {14,26,42}\{14,26,42\}: Apply the Triangle Inequality Theorem to the second set {14,26,42}\{14,26,42\}.\newlineCheck if 14 + 26 > 42, 14 + 42 > 26, and 26 + 42 > 14.\newlineCalculation: 14+26=4014 + 26 = 40, 14+42=5614 + 42 = 56, 26+42=6826 + 42 = 68.\newline40 > 42 (False), 56 > 26 (True), and {14,26,42}\{14,26,42\}00 (True).\newlineThe first condition 14 + 26 > 42 is not satisfied, so this set cannot represent the sides of a triangle.
  4. Apply Theorem to Set {6,14,22}\{6,14,22\}: Apply the Triangle Inequality Theorem to the third set {6,14,22}\{6,14,22\}.\newlineCheck if 6 + 14 > 22, 6 + 22 > 14, and 14 + 22 > 6.\newlineCalculation: 6+14=206 + 14 = 20, 6+22=286 + 22 = 28, 14+22=3614 + 22 = 36.\newline20 > 22 (False), 28 > 14 (True), and {6,14,22}\{6,14,22\}00 (True).\newlineThe first condition 6 + 14 > 22 is not satisfied, so this set cannot represent the sides of a triangle.
  5. Apply Theorem to Set {15,18,34}\{15,18,34\}: Apply the Triangle Inequality Theorem to the fourth set {15,18,34}\{15,18,34\}.\newlineCheck if 15 + 18 > 34, 15 + 34 > 18, and 18 + 34 > 15.\newlineCalculation: 15+18=3315 + 18 = 33, 15+34=4915 + 34 = 49, 18+34=5218 + 34 = 52.\newline33 > 34 (False), 49 > 18 (True), and {15,18,34}\{15,18,34\}00 (True).\newlineThe first condition 15 + 18 > 34 is not satisfied, so this set cannot represent the sides of a triangle.

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