This activity uses the "Free" and "Powerful" Google sketchup application to aid the visualisation of 3D geometry problems. The third dimension can really make problems more confusing and it is a really important skill to be able to see 2 dimensional planes within a 3 dimensional diagram. Then, it can easily be seen that 3D trigonometry is really only repeated 2 Dimensional trigonometry. "Orbit" the sketchup file to...
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