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Thales' theorem (Theorem)

Let $ A$ and $ B$ be two points and $ C$ a point on the semicircle above them. Then the angle $ ACB$ is $ 90^\circ$.

\includegraphics{thales2.eps}



"Thales' theorem" is owned by mathwizard.
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See Also: angle of view of a line segment, proving Thales' theorem with vectors, area of spherical calotte by means of chord


Attachments:
proof of Thales' theorem (Proof) by mathwizard
proving Thales' theorem with vectors (Proof) by pahio
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Cross-references: angle, points
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This is version 3 of Thales' theorem, born on 2002-06-06, modified 2002-06-09.
Object id is 3063, canonical name is ThalesTheorem.
Accessed 11855 times total.

Classification:
AMS MSC: 51-00 (Geometry :: General reference works )
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