A directory of useful objects found on the web for teaching Maths.
https://www.geogebra.org/m/fyqAUV22
GeoGebra
Explore the derivation of the formula for the area of a circle.
Note, this interactive does not work in Internet Explorer (tested in version 11). Use Chrome or other.
10 July 2013 Edit: 20 September 2018
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