Answer:
20) ∠2 = 55°
22) ∠6 = 129.5°
Explanation:
20) ∠2 = 55° (assuming lines a and b are parallel, ∠4 and ∠2 are alternate interior angles, which implies they are parallel.)
22) ∠6 and ∠7 are co-exterior angles, which implies they add up to 180°. Therefore, ∠6 = 180 - ∠7, ∠6 = 180 - 50.5, ∠6 = 129.5°.