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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
Silhouettes
רישום חופשי
Exploding cube
koch tool
Nefroida
Discover Resources
Amp & B graph of A*cos(B*x)
Geogebra House
Orientable closed surface
Simulating Multi-step Experiments: IM 7.8.7
Position, Velocity, Acceleration
Discover Topics
Conic Sections
Perimeter
Congruence
Reflection
Step Functions