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GeoGebra
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Butterfly theorem
Author:
Healey Lee
GeoGebra
New Resources
Napoleon's Theorem
Isosceles Triangle: Quick Construction
Construct a Square
Linear Cross Section Exercise
Drag that Point!
Discover Resources
Interactive Diagram ( x - t )
Exterior Angles of a Polygon
Seasons and the sun -big
Snowball Animation
Beads on a hoop
Discover Topics
Incircle or Inscribed Circle
Equilateral Triangles
Optimization Problems
Quadrilaterals
Special Points