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Answer:
180-80=100°
so angle ACB is 100°
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10
Answer is 40°
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∠ AOB = 80°
We know that angle made on center = 2 × angle made on circumference
⇒ ∠ AOB = 2 × ∠ ACB
⇒ 80 = 2 × ∠ ACB
⇒ ∠ ACB = 40°
Thus the angle ACB = 40°
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