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twelve around one

Author:Arthur Lee

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繪畫垂直線
Isosceles Right Triangle
Parabolas, Lines and Nomograms
Pythagorean Template: Integer Legs
Congruent Figures

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Trig Transformations
Rotational Symmetry
Pythagoras on a 3-4-5 triangle
EasingFunctions
Caroline_NumericalInvariantsC

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Plane Figures or Shapes
Line Segment
Trigonometry
Circle
Special Points

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