origami

Author:tom9358

Don't get confused my the multitude of lines, just look at the green and red ones. I try to prove with geometry and/or algebra what's shown here: https://youtu.be/zU9FORjUnj0 Also, thanks James Grime and Daniel Hubbard, for the nice puzzle!

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Plane Figures or Shapes
Similar Triangles
Tangent Line or Tangent
Standard Deviation
Line Segment