answer
17-18. Angle 6 and 2 form a supplementary because, angle 6 is obtuse and angle 2 is acute. Now we have both angles to form a measurement of 180.
19-10. Because The two angles (angle 6 and 3) are consecutive interior angles when they lie between the two lines on same side of the transversal, therefore If two parallel lines are cut by a transversal, corresponding angles are congruent.
