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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
Taylor Polynomial
Poorly Drawn Parallelograms 3
Exploring the Derivative of an Exponential Function
alg2_05_05_01_slider_practice_flvs
Poorly Drawn Parallelograms 2
Discover Resources
SLIDERS AND ANIMATION tutorital
Central and Axial Symmetry
Beautiful triangle
Turchia-Kai triangolo 2
Daniel Piker
Discover Topics
Set Theory
Rotation
Secant Line or Secant
Centroid or Barycenter
Tangent Line or Tangent