Which statements about the angles of the triangle are true? Check all that apply.

A triangle has angles 6, 7, 8. Angle 7 has an exterior angle of 1. A diagonal line extends from angle 8 to form angle 2. Angle 6 has exterior angle 5. The line extends to form angles 3 and 4.
Angle 1 is an exterior angle.
Angle 2 is an exterior angle.
Angle 4 is an exterior angle.
Angle 7 is an adjacent interior angle.
Angle 6 is an adjacent interior angle. It is adjacent to the exterior angle 4.
Angles 6 and 8 are remote interior angles to the exterior angle 1.
Angles 6 and 7 are remote interior angles to the exterior angle 2.
Angles 7 and 8 are remote interior angles to the exterior angle 4.