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.[more]
Drag the orange point to change the figure.[less]
Contributed by: Jay Warendorff (March 2011)
Open content licensed under CC BY-NC-SA
"Angle Bisector for an Angle Subtended by a Tangent Line"
Wolfram Demonstrations Project
Published: March 7 2011