Question
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In triangle is 3 cm long and is 5 cm long. According to the Triangle
Inequality Theorem, which two lengths are possible lengths of ? (1 point)



Ask by Schultz Floyd. in the United States
Mar 21,2025

Upstudy AI Solution

Tutor-Verified Answer

Answer

The possible lengths for are cm and cm.

Solution

We are given that in triangle :
  • cm
  • cm
  • Let cm.
By the Triangle Inequality Theorem, the sum of the lengths of any two sides must be greater than the length of the third side. Therefore, we have three inequalities:
  1. implies or .
  2. implies or .
  3. implies which simplifies to (this inequality is automatically satisfied since is positive).
Combining the first two nontrivial inequalities, we obtain:
Now, we check the given possible lengths:
  • cm satisfies .
  • cm satisfies .
  • cm does not satisfy (it is equal to 2, not greater than 2).
  • cm does not satisfy .
Thus, the possible lengths for are cm and cm.

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Mind Expander

To determine the possible lengths of in triangle , we can apply the Triangle Inequality Theorem. This theorem states that the sum of the lengths of any two sides of a triangle must be greater than the length of the third side.
Let be denoted as . According to the Triangle Inequality Theorem:
  1. implies or .
  2. implies or .
  3. implies or (which doesn’t provide any new information since lengths are positive).
From these inequalities, we can conclude that must satisfy . Therefore, the possible lengths for are cm and cm. So the correct options are:

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