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August 14th, 2017, 10:34 AM   #1
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From: Pakistan

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Please Help Me about this problem

Using property of Circles please solve this problem Thanks in Advance
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August 14th, 2017, 01:00 PM   #2
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Your note is very hard to read. I suggest you type it in directly.
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August 14th, 2017, 03:01 PM   #3
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Your solution is correct.
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August 14th, 2017, 03:24 PM   #4
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The answer is essentially correct, but it should be stated that angle A is calculated based on the fact that the angles of a triangle sum to 180°. The theorem about angles subtended is stated inaccurately.

The reflex angle subtended by the major arc AC at O is 360° - 60° - 60° = 240°. Hence (by the inscribed angle theorem) the angle subtended by that arc at B (the angle you want to find) is 240°/2, which is 120°.
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