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help with circle problem

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Given: m∠APC=27°, m DC = 27° Find: m AB

 

 Jul 30, 2020

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angle(APC)  =  ½·( arc(AB) - arc(DC) )  

             27o  =   ½·( arc(AB) - 27o )  

             54o  =  arc(AB) - 27o

             81o  =  arc(AB)

 Jul 30, 2020

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