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Sunspots (Sonnenflecken)

Author:Matthias Hornof

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apec
Classifying Triangles
Mondrian's Puzzle
Area of a Circle Illustrated
Untitled

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Slope with sliders
Surface Area
Lexi Chubon 9-Point Circle
Analogy between statics & geometry
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Pythagoras or Pythagorean Theorem
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