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04-03-2018
Mathematics

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AC is tangent to circle O at A. If mBY =24, what is m

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calculista calculista

04-03-2018

the correct question in the attached figure

we know that
the inscribed angle measures half of the arc it comprises.
then
m∠YAB=(1/2)*m∠BY-------------> m∠YAB=(1/2)*24°=12°
m∠YAC=90°-m∠YAB=90°-12°=78°

the answer is the option C) 78°

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