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The Seven Theorems

Angle between tangent and radius Sixth circle theorem: What do you notice about the angle between tangent and radius, α & β? You can use the cursor to move point C, and you can change the size of the circle by moving point A or B. This is a Java Applet created using GeoGebra from www.geogebra.org - it looks like you don't have Java installed, please go to www.java.com If you need them, the seven circle theorems here Tim Devereux, Created with GeoGebra