Kinematic method: Equilateral triangles on parallelogram

Two equilateral triangles are constructed on two adjacent sides of a parallelogram. Prove that an equilateral triangle is formed by the outside vertices of the triangles and the vertex of the parallelogram that is not part of the equilateral triangles.

 

alfinio

 
Resource Type
Activity
Tags
angle  equilateral  equilateral-triangle  kinematic  method  parallelogram  triangles 
Target Group (Age)
19+
Language
English (United States)
 
 
GeoGebra version
4.0
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1523
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