Tangent Points on a Semicircle
Requires a Wolfram Notebook System
Interact on desktop, mobile and cloud with the free Wolfram Player or other Wolfram Language products.
Let AB be the diameter of a semicircle. Let CD and CE be tangents from a point C. Let the intersection of AE and BD be F. Then CF is perpendicular to AB.
[more]
Contributed by: Jay Warendorff (March 2011)
After work by: Antonio Gutierrez
Open content licensed under CC BY-NC-SA
Snapshots
Details
The statement of the theorem is in Archimedes' Book of Lemmas: Proposition 12.
Permanent Citation
"Tangent Points on a Semicircle"
http://demonstrations.wolfram.com/TangentPointsOnASemicircle/
Wolfram Demonstrations Project
Published: March 7 2011