Triangles unit test apply the triangle inequality theorem to determine if sides with lengths of 3 feet, 4 feet, and 5 feet form a triangle.

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The triangle inequality theorem states that for three sides to form a triangle, the sum of the lengths of any two sides must be greater than the length of the remaining side.

Let's denote the sides as:

  • \( a = 3 \) feet
  • \( b = 4 \) feet
  • \( c = 5 \) feet

We need to check the following conditions:

  1. \( a + b > c \)
  2. \( a + c > b \)
  3. \( b + c > a \)

Now, let's check each condition:

  1. Check \( a + b > c \): \[ 3 + 4 > 5 \implies 7 > 5 \quad \text{(True)} \]

  2. Check \( a + c > b \): \[ 3 + 5 > 4 \implies 8 > 4 \quad \text{(True)} \]

  3. Check \( b + c > a \): \[ 4 + 5 > 3 \implies 9 > 3 \quad \text{(True)} \]

Since all three conditions are true, the sides with lengths of 3 feet, 4 feet, and 5 feet do indeed form a triangle according to the triangle inequality theorem.

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