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A circle centered at O is circumscribed about Triangle ABC as follows:  What is the measure of BAC?

 

 Jul 9, 2021
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Angle COA  =  360  - 2 (100)   =  160

 

Angle CAO =   (180  -160)  /2   =   10°

 

And since   BO  = AO  then  angle BAO  =  (180 - 100)  / 2     =  40

 

So....angle  BAC  =   angle COA  +  angle BAO   =  10  + 40   =  50°

 

cool  cool  cool

 Jul 9, 2021

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