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Question: What type of angles are used to help prove that the sum of the measures of the interior angles of a triangle is always $180^\circ$? (1 point)Multiple Choice Options (Responses)( ) right angles( ) obtuse angles( ) alternate interior angles( ) vertical angles
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GPT-5 mini
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alternate interior angles
Reason: Draw through a vertex a line parallel to the opposite side; the two angles formed are alternate interior angles equal to the other two triangle angles, and together with the vertex angle form a straight line of 180°.
Reason: Draw through a vertex a line parallel to the opposite side; the two angles formed are alternate interior angles equal to the other two triangle angles, and together with the vertex angle form a straight line of 180°.
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