Another way to introduce Thales' circle theorem
Use the Point tool 
to check if the third vertex C of triangle ABC makes the triangle right.
This applet is just a proof of concept. It could be further developed by editing the Global JavaScript (after downloading the applet).
For the details please visit GeoGebra's JavaScript Reference.
to check if the third vertex C of triangle ABC makes the triangle right.
This applet is just a proof of concept. It could be further developed by editing the Global JavaScript (after downloading the applet).
For the details please visit GeoGebra's JavaScript Reference.