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Illusion of length

Author:Daniel Mentrard

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apec
Fractal Tétraèdre. Dilatation -1/2 centre triangles
Sum of Squares: Proof without Words
Untitled
The Gardener's Ellipse

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Draw Angles
Perpendicular Conjecture
Playing with blocks
Scalar product
Shadow with inecuations

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Angles
Symmetry
Line Segment
Fractions
Pythagoras or Pythagorean Theorem

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