Third circle theorem

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The Seven Theorems

Angles in the same segment

Third circle theorem:

Compare the sizes of angles α & β, as you use the cursor to move point C or D around the circumference.
It doesn't change either angle β- they stay the same!
What is the effect of moving point E?
And finally, what happens when you move point 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

Third circle theorem

Home First page Theorem 1 Theorem 2 Theorem 3 Theorem 4 Theorem 5 Theorem 6 Theorem 7 The Seven Theorems

Angles in the same segment

Home
First page
Theorem 1
Theorem 2
Theorem 3
Theorem 4
Theorem 5
Theorem 6
Theorem 7
The Seven Theorems