Answer: ∠1 and ∠8
Step-by-step explanation:
Given : Line b is parallel to line c .
In the given figure , a traversal line is passing through line b and c.
∠2=120°
Then , ∠1 +∠2=180° [linear pair]
⇒ ∠1=180°-120°=60°
Now, ∠4 and ∠1 are vertical angles.
Since vertical angles are congruent.
∴ we have , ∠4 ≅ ∠1 =60°
Also, ∠4 and ∠8 are corresponding angles and corresponding angles are congruent.
∴ we have , ∠4 ≅ 8 =60°
∠2 cannot be congruent to ∠4, since both have different measures
∠7 cannot be congruent to ∠4, since ∠7 is congruent to ∠2 (Alternate exterior angles)
