Geometry Geometry Math Forum

August 14th, 2017, 10:34 AM   #1
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Joined: Aug 2016
From: Pakistan

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 August 14th, 2017, 01:00 PM #2 Global Moderator   Joined: May 2007 Posts: 6,539 Thanks: 591 Your note is very hard to read. I suggest you type it in directly. Thanks from Hammad
 August 14th, 2017, 03:01 PM #3 Math Team   Joined: Jul 2011 From: Texas Posts: 2,756 Thanks: 1407 Your solution is correct. Thanks from Hammad
 August 14th, 2017, 03:24 PM #4 Global Moderator   Joined: Dec 2006 Posts: 19,162 Thanks: 1638 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°. Thanks from Hammad

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