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A strange way to draw an ellipse with a compass

Author:Daniel Mentrard

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Average Distance
bewijs stelling van Pythagoras
Circles - Relative Positions
Quiz: Vertical Angles and Linear Pairs
Triangle Flexer

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Thymio geometry
Phantom Graph cosh(x^2/2)
Making Mathematics Visible: Forty-Sixth Annual Conference
MVT example 2
'Tangram' Puzzle 'Cat'

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Centroid or Barycenter
Cosine
Geometric Mean
Derivative
Step Functions

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