Answer:
∠ BAC = 28.5°
Explanation:
∠ AOB = 180° - 57° = 123° ( straight angle )
OA and OB are congruent ( radii of the circle ) , then Δ AOB is isosceles with base angles congruent, that is
∠ BAC = ∠ ABO , then
∠ BAC = = = 28.5°
I rhink the answer would be 273°
57+180=237°
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