The correct statements are:
- Angle 1 is an exterior angle.
- Angle 7 is an adjacent interior angle.
- Angles 6 and 8 are remote interior angles to the exterior angle 1.
What is a triangle?
A triangle is a polygon with three sides and three vertices. It is a closed 2-dimensional shape with 3 sides.
The exterior angles are those which are constructed by extending one side of a triangle. The exterior angles, therefore, are 1, 5, and 3.
The angles of a triangle that share a common side are called adjacent interior angles. The adjacent interior angles are 1 and 7, 6 and 5.
Remote interior angles are those that don't share a vertex or a corner with the exterior angle of a triangle. The angles 6 and 8 are remote interior angles to angle 1.
Therefore the correct statements are 1, 4, and 6.
Learn more about triangles here:
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