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Given that point O is the center of the circle and OA=5, OC=8, and angle ACO=30∘, find cos(angle BOA). 

 

 Jun 28, 2020
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Given that point O is the center of the circle and OA=5, OC=8, and angle ACO=30∘, find cos(angle BOA). 

 

Use the Law of cosines to calculate side AC and the angle OAB.

 

∠OAB = ∠OBA

 

∠BOA = 180º - ( ∠OAB + ∠OBA )  smiley

 Jun 29, 2020

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