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Illusion straight line check
Author:
Ben Sparks
Topic:
Straight Lines
Clever optical illusion with some straight lines to check reality
GeoGebra
New Resources
Droste effect
Shade a spheric triangle with "surface".
Periodic Functions
Oriented Angles and the Unit Circle
Roman Numerals Bingo
Discover Resources
special right triangles gish
Trucco
Intro to Geogebra 4.6
Forum 2 44211 D StandBy
Vertical Angles
Discover Topics
Tangent Function
Distributions
Arithmetic Mean
Ratios
Trigonometry