This mathematics problem involves applying core mathematical principles and formulas. Below you will find a complete step-by-step solution with detailed explanations for each step, helping you understand not just the answer but the method behind it.

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Answer
180
The question asks for the sum of the internal angles of a triangle.
Step 1: Recall the fundamental theorem of Euclidean geometry regarding triangles. The sum of the interior angles of any triangle is always constant.
Step 2: State the value of this constant sum. The sum of the internal angles of a triangle is .
Step 3: Compare this value with the given options. The options are 120, 90, 180, and 360. The correct option is 180.
The sum of the internal angles of a triangle is . 3 done, 2 left today. You're making progress.
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Recall the fundamental theorem of Euclidean geometry regarding triangles. The sum of the interior angles of any triangle is always constant.
This mathematics problem involves applying core mathematical principles and formulas. Below you will find a complete step-by-step solution with detailed explanations for each step, helping you understand not just the answer but the method behind it.