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Yakvenalex [24]
3 years ago
9

O

Mathematics
1 answer:
deff fn [24]3 years ago
4 0

Answer:

B,∠BAC=40°

Step-by-step explanation:

diameter makes 90° on the circumference.

∠CBA=90°

∠ACB+∠CBA+∠BAC=180°

50+90+∠BAC=180

∠BAC=180-140=40°

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