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A circle centered at O is circumscribed about triangle ABC as follows.  What is the measure of angle OAB?

 

 Jul 20, 2022
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Note that  OB  =OA

 

So triangle BOA is isosceles with angles OAB and OBA  equal

 

So.....measure  of angle OAB =  (180 - 113) / 2 =  67/2  =  33.5° 

 

 

cool cool cool

 Jul 20, 2022

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