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Help.

NotSoSmart  Apr 12, 2017
 #1
avatar+86890 
+2

Note that COB  + AOB  =  180   ......so....

 

COB + 87   = 180      subtract 87 from both sides

 

COB  =  93

 

And BAC is an inscribed angle that intercepts the same arc as central angle COB.....but.....an inscribed angle  intercepting the same arc as a central angle measures 1/2 of that central angle...

 

So.....BAC   = (1/2)COB   =  (1/2)93  =  46.5

 

 

cool cool cool

CPhill  Apr 12, 2017

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