A directory of useful objects found on the web for teaching Maths.
https://plus.google.com/u/0/b/100553185723615605458/117008945303447204098/posts/SzkKcbULfvL
Visualization
A dynamic image which shows the creation of a parabola as the locus of a point equidistant from the focus and directrix. A gif file.
11 November 2014 Edit: 11 November 2014
User submitted, thanks to Jenny Lill
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