A collection of excellent free resources for demonstrating the various circle theorems:
Tim Devereux has created GeoGebra applets which allow exploration of the circle theorems. You can access each theorem from the menu on the left which includes a useful summary of all the theorems.
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From Suffolk Maths there are many GeoGebra applets available including a set for the Circle theorems. The collection includes a PowerPoint with instructions for drawing circles and measuring angles with Geogebra.
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From Nrich comes an interactive Geoboard and a selection of problems to introduce circle theorems. As with all Nrich resources teachers’ notes are included. See these on the Subtended Angles problem for example.
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On Ron Barrow’s excellent Waldomaths site there are applets covering the vocabulary needed and for demonstrating the various theorems.
Move A, B, C and D by dragging and experiment.
Note the links to the other circle theorem applets and to a set of videos.
Note also the options at the bottom of the screen.
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Nice resources. Thank you for sharing Colleen.