Thale's Theorem: Let A, B, C be 3 points on a circle where \overline{\color{green}A\color{blue}C} is a diameter of the circle. Then \angle ABC is a right angle and ΔABC is a righttriangle.
Interactivity

DIY: Construct Thale's Theorem Directions
Get the latest Java Plugin here. 
Related Topics:
Up one level  
This work is licensed under a Creative Commons AttributionShare Alike 3.0 United States License. 