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The Butterfly Theorem
Author:
Lamberto Lamberti
http://www.cut-the-knot.org/pythagoras/Butterfly.shtml
GeoGebra
New Resources
Sum of Squares: Proof without Words
Classifying Triangles
Regular Polygons and Equivalent Triangles
Focus and Directrix
Area of a Trapezoid
Discover Resources
ellipse_sequence
study
Perpendicular lines
Geogebra_Classwork 10/19
arccos(x) entre 0 et 2π
Differentiation from first principles
Discover Topics
Multiplication
Centroid or Barycenter
Rectangle
Linear Regression
Similar Triangles