NCEA Level One 1.9 Geometrical Reasoning

This Geometers Sketchpad Document has the visual proof of all the rules required for 1.9.
The two videos give some idea of how it can be used. It can be used by teachers to illustrate the rules as moving diagrams or used by students to play with the rules and come to terms with the multiple views that a moving diagram can provide. The issue with diagrams in books is that they show only a static image and often actual problems look quite different. Excuse the unpolished performance, this is not a lesson! Just an overshare!

Related Wiki that I am working on 1.9 Geometrical Reasoning

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