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Sample illusion
Author:
Dave Van Leeuwen
When segments are shown, the impression is that of rotation. When segments are turned off and curve is shown, the same motion gives a very different impression.
GeoGebra
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ผลรวมกำลังสองและกำลังสี่ของระยะทาง
Conditions for Similarity of Triangles (2) 相似三角形的判別條件(2)
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