Missing Angle

From a @mrautomatic sketch. I kind of like that you can't see the third point always, but you can move the vertices to shrink the triangle without changing the angles.
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John Golden —

 
Resource Type
Activity
Tags
sum  triangle 
Target Group (Age)
11 – 14
Language
English (United States)
 
 
GeoGebra version
4.4
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631
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