Math 2 Quiz
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Analyze this proof about the exterior angle of a triangle: "In triangle DEFDEF, exterior angle ∠EFG\angle EFG is formed by extending side EFEF through FF. Since ∠EFG\angle EFG and ∠EFD\angle EFD are supplementary, and ∠D+∠E+∠EFD=180°\angle D + \angle E + \angle EFD = 180° (Triangle Angle Sum), we get ∠EFG=∠D+∠E\angle EFG = \angle D + \angle E." What step in the reasoning needs clarification?
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