Transforming Slope Triangles

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Points A and B are moveable. Click Translate: Point E will appear. Move it. Click Rotate: A slider will appear. Change the slider. What do you notice? What do you wonder? ~Math Forum

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繪畫垂直線
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Whatever
Untitled
cyclic quad
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Simplest Curve Stitching

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Geometric Transformations
General Quadrilateral
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Expected Value