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Četvorougao
Author:
Marko Berar
GeoGebra
New Resources
Ellipse, Hyperbola and Circle as Envelopes
"Compressed" Astroid as Envelope
Teorema Japonês para quadriláteros inscritos em uma circunferência
Parallel or Not? (V2)
Stairs (Optical Illusion)
Discover Resources
Centre of mass of arc and sector
Translations
back projection
rotations 3.2
Pythagoras 2