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Stathis Koutras' proof of the Butterfly Theorem
Author:
user3208
GeoGebra
New Resources
Construcing a 60° Angle and Properties of 30°-60°-90° Triangles
Comparing Two Quantities by Percentage
Subdivision of a polynomial into triangles.
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Sticky point to list of points
Discover Resources
Nets of solids
Graphs of root functions
Coordinates of Points on the Unit Circle
Rational Numbers
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Dilation
Optimization Problems
Trapezoid
Symmetry
Real Numbers