Sum of angles of a triangle: the proof

Very classical picture. Based in part on the work by Andy Talmadge.

 

Ilya V. Schurov

 
Resource Type
Activity
Tags
angle  parallel-lines  triangle-angle-sum 
Target Group (Age)
6 – 19+
Language
English
 
 
GeoGebra version
5.0
Views
1601
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