External angles are angles formed between one extended side and one unchanged side. The angles out of the given angles which are external angles are: angle 5, angle 6 and angle 8
What is external angle?
In a closed figure, keep it same from all sides. Take one of its side and extend it further. The angle that extended side makes with the adjacent side outwardly, is called an external angle.
For the given case, we can see that angle 8 is made when one side is kept constant and other side is extended. Same happens for angle 5 and angle 6.
Angle 1 and 2 and 3 are inside of the triangle, so internal angles.
Angle 4 is angle from extended side to itself, so its not external angle as it has to be from extended side to the adjacent unchanged side.
Angle 7 is angle between two extended side, thus, by definition, not an external angle.
Thus, The angles out of the given angles which are external angles are: angle 5, angle 6 and angle 8
Learn more about external angles here:
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