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Angle Bisector for an Angle Subtended by a Tangent Line


	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

Angle Bisector (Wolfram MathWorld)

Circle Tangent Line (Wolfram MathWorld)

Tangent Circles (Wolfram MathWorld)

"Angle Bisector for an Angle Subtended by a Tangent Line" from The Wolfram Demonstrations Project
http://demonstrations.wolfram.com/AngleBisectorForAnAngleSubtendedByATangentLine/

Contributed by: Jay Warendorff

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