Answer:
Option D) Angle D is not an exterior angle.
Step-by-step explanation:
An exterior angle of a triangle is formed between the extended line DF and line DE.
This means Exterior angle of a triangle is supplementary to the interior angle formed on the same line.
So, exterior angle D + ∠ EDF should be equal to 180° [ By definition ]
Therefore, angle D shown in the diagram is not the exterior angle.
Option D is the answer.
