A directory of useful objects found on the web for teaching Maths.
http://www.timdevereux.co.uk/maths/geompages/index.html
GeoGebra, Interactive
Investigate using GeoGebra these circle theorems: angles at the centre and at the circumference, angle in a semicircle, angles in the same segment, angles in a cyclic quadlateral, length of tangents, angle between circle tangent and radius, alternate segment theorem.
25 November 2011 Edit: 22 February 2014
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