Question

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Answer 1

Answer:

Step-by-step explanation:

Angle acb= 40 degrees

Angle subtended by a chord at the centre is twice the angle subtended by the same chord anywhere else on the circle

Answer 2

Answer: 40

Step-by-step explanation: since angle subtended by an arc at centre is double the angle subtended by remaining part of the circle

=> <ACB=1/2*80 =40

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