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Urok20
Author:
Grigori Romanov
GeoGebra
New Resources
Ellipse as Envelope - Correspondence Method
History of Maths - Work in progress
Linear Cross Section Exercise
Play C3 E3 G3 C4_C4
Rotating rings: Community Showcase
Discover Resources
Last draft
A Two Dimensional Basis for a Plane in Three Dimensions
pow 7 part 1
Triangle with all 4 points of concurrency (centroid, orthocenter, incenter, circumcenter)
Two Rods and a Bungee Cord