Geometry

Question Analysis:  
This question tests knowledge of the Triangle Sum Theorem, which states that the sum of the interior angles in any triangle is 180°.  

Key Concept Explanation:  
In any triangle, the measures of the three interior angles add up to 180°.
This property is fundamental in geometry for solving various problems involving triangles.  

Step-by-Step Solution:  
Given:  
- Angle A = 50°  
- Angle B = 70°  
To find Angle C:  

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