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Bollen AL
Author:
Mr. Bollen
GeoGebra
New Resources
Ellipse, Hyperbola and Circle as Envelopes
van Aubel's Theorem
Angles and Intersecting Lines: Quick Investigation
Limaçon / Cardioid as a Locus - A Classical Construction
Viviani's Window
Discover Resources
P and r(P) lie on Rectangular Circum-Hyperbola
Special Angles on Parallel Lines
Poly2
blank papers
The Same Triangle?
Discover Topics
Arithmetic Mean
Equilateral Triangles
Quadratic Equations
Isosceles Triangles
Integral Calculus