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{{Geogebra|GURbU5y2}}[http://itforchange.net IT for Change]
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{{Geogebra|GURbU5y2}}{{Geogebra|td5dbKMV}}[http://itforchange.net IT for Change]
    
[[File:Angle sum property of a triangle.ggb]]
 
[[File:Angle sum property of a triangle.ggb]]
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