Tangent-Chord Angle

Tangent-Chord Angle

Acute angle formed by a chord of a circle and a tangent to the circle at one of the endpoints of the chord.


In the figure below, angle BAC is a tangent-chord angle to the circle with centre O. The point of tangency is the endpoint A of chord AB. Line segment AC is a tangent to the circle at point A.


In the example above, m\(\angle {\textrm{BAC}}=\frac{\textrm{m}\angle{\textrm{AOB}}}{2}\)

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