Angles of a polygon

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The movement of a paperclip on the sides of a triangle points the way to the generation of a formula for the sum of the interior angles of a polygon.

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The VITALmaths and VITALmathsLIC site consists of a databank of short and funky video clips that specifically interrogate the conceptual aspects of a mathematical idea, process or concept. Some of the video clips contain strategic dialogues to encourage appropriate mathematical talk and conversation.

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SANDBOXmaths is a collection of more experimental video clips done by students in their mathematics teacher-training classes and researchers wishing to use specific video clips in their teaching and research.
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The APPLETmaths site consists of a selection of GeoGebra applets that were developed by students and researchers for their research projects.
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