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Geometry
Circles
Tangent lines
AC is tangent to circle O at A. AB is the diameter of circle o
If mBY=68°, what is m∡YAC?
1 answer
Since AC is tangent to the circle at A, this means that angle BYA is supplementary to angle YAC. Therefore, angle YAC = 180° - 68° = 112°.
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