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The Butterfly Theorem
Author:
Lamberto Lamberti
http://www.cut-the-knot.org/pythagoras/Butterfly.shtml
GeoGebra
New Resources
Flip Flop
探究由平行線和截線所成的角
Explore the invariant lines of matrix {{-2,5},{6,-9}}
Blancmange curve (fractal)
alg2_05_05_01_applet_exp_2_flvs
Discover Resources
Standard Normal Density
Regression gradient help
Gabriel De La Cruz
Casey's Angle
kaleidoscopic swirls
Discover Topics
Ellipse
Median Value
Reflection
Trigonometric Functions
Terms