# Thales’ theorem

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

Title Thales’ theorem ThalesTheorem 2013-03-22 12:45:24 2013-03-22 12:45:24 mathwizard (128) mathwizard (128) 6 mathwizard (128) Theorem msc 51-00 AngleOfViewOfALineSegment ProvingThalesTheoremWithVectors AreaOfSphericalCalotteByMeansOfChord