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

{12,19,31}

{10,25,37}

{10,15,26}

{7,21,27}

Which of the following sets of numbers could represent the three sides of a triangle?\newline{12,19,31} \{12,19,31\} \newline{10,25,37} \{10,25,37\} \newline{10,15,26} \{10,15,26\} \newline{7,21,27} \{7,21,27\}

Full solution

Q. Which of the following sets of numbers could represent the three sides of a triangle?\newline{12,19,31} \{12,19,31\} \newline{10,25,37} \{10,25,37\} \newline{10,15,26} \{10,15,26\} \newline{7,21,27} \{7,21,27\}
  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 First Set: Apply the Triangle Inequality Theorem to the first set 12,19,31{12, 19, 31}. Check if the sum of the two smallest numbers is greater than the largest number: 12 + 19 > 31?
  3. Calculate First Set: Perform the calculation for the first set: 12+19=3112 + 19 = 31. Since 3131 is not greater than 3131, the first set does not satisfy the Triangle Inequality Theorem.
  4. Apply Theorem to Second Set: Apply the Triangle Inequality Theorem to the second set {10,25,37}\{10, 25, 37\}. Check if the sum of the two smallest numbers is greater than the largest number: 10 + 25 > 37?
  5. Calculate Second Set: Perform the calculation for the second set: 10+25=3510 + 25 = 35. Since 3535 is not greater than 3737, the second set does not satisfy the Triangle Inequality Theorem.
  6. Apply Theorem to Third Set: Apply the Triangle Inequality Theorem to the third set {10,15,26}\{10, 15, 26\}. Check if the sum of the two smallest numbers is greater than the largest number: 10 + 15 > 26?
  7. Calculate Third Set: Perform the calculation for the third set: 10+15=2510 + 15 = 25. Since 2525 is not greater than 2626, the third set does not satisfy the Triangle Inequality Theorem.
  8. Apply Theorem to Fourth Set: Apply the Triangle Inequality Theorem to the fourth set {7,21,27}\{7, 21, 27\}. Check if the sum of the two smallest numbers is greater than the largest number: 7 + 21 > 27?
  9. Calculate Fourth Set: Perform the calculation for the fourth set: 7+21=287 + 21 = 28. Since 2828 is greater than 2727, the fourth set satisfies the Triangle Inequality Theorem.
  10. Conclude Valid Triangle Set: Conclude that the fourth set {7,21,27}\{7, 21, 27\} is the only set that could represent the sides of a triangle.

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