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From Karnataka Open Educational Resources
→Activity No # 2. Angle sum property of a triangle
Please click the following link for the proof
Please click the following link for the proof
# [http://http://courses.metastudio.org Please click the following link for the proof] :
# [http://tube.geogebra.org/student/m236907 Please click the following link for the proof] :
{| style="height:10px; float:right; align:center;"
{| style="height:10px; float:right; align:center;"
