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21 bytes added ,  10:21, 1 June 2018
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[http://itforchange.net IT for Change]
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{{Geogebra|GURbU5y2}}[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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