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Dudeney's puzzle + lesson plan
Author:
Ivan De Winne
Dudeney's famous haberdasher puzzle (1908) Cut an equilateral triangle into four pieces that can be arranged to form a square with the same area
GeoGebra
New Resources
Kopie von parabel - parabol
alg2_05_05_04_applet_exp_fxn_flvs
Average Rate of Change: Graph a Function (1)
Shade a spheric triangle with "surface".
Average Rate of Change: Graph a Function (2)
Discover Resources
Classifying and Creating Quadrilaterals
Enlargement
OpenMiddle-Real
Transformace f(x) -> k f(x)
กราฟของสมการเชิงเส้น
Discover Topics
Pyramid
Sine
Normal Distribution
Stochastic Process or Random Process
Coordinates