Angle Bisector for an Angle Subtended by a Tangent Line

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Let a circle be internally tangent to another circle at the point A. Draw a tangent line through a point C on the inner circle and let D and B be its points of intersection with the outer circle. Then AC bisects DAB.


Drag the orange point to change the figure.


Contributed by: Jay Warendorff (March 2011)
Open content licensed under CC BY-NC-SA




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