Which angle pair is congruent? 1. ∠BEC and ∠DEF
2. ∠BEA and ∠DEF
3. ∠AEF and ∠CED
4. ∠DEF and ∠CED

Step-by-step explanation:

2 because they are the same 2 lines

B) <BEA and <DEF

Step-by-step explanation:

To find a congruent angle pair, look for vertical angles. Which is <BEA and <DEF

∠acb = 8°

step-by-step explanation:

∠xba lies on the circle and is half the measure of the intercepted arc ax

hence

measure of arc ax = 2 × 42° = 84°

∠acb is outside the circle and is

∠acb = (arcab - arcax ), hence

∠acb = 0.5 (100 - 84) = 0.5 × 16° = 8°