Question 6:
The relationship between ∠2 and ∠7 is that they are corresponding angles.
Question 8:
Since ∠1 and ∠2 are alternate exterior angles, m∠2=m∠1 so 180°
Question 9:
Options A, C, and D are correct.
*Note*
For option B the angles are supplementary.
For option E the angles are vertical angles.
Question 10:
∠1 and ∠2 lie in the interior of the parallel lines and are on opposite sides of the transversal. So, ∠1 and ∠2 are equal.