Which statements about the angles of the triangle are true? Check all that apply. 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. Angle 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. Angle 7 and 8 are remote interior angles to the exterior angle 4.