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170821 多邊形內角和
Author:
吳承翰
GeoGebra
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平行線的判定
直線的斜率
垂直線的斜率
平行線的斜率
正方形雪花图案
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Task 7: Visualize the Theorem of Thales
小數（小四下）
畢式定理 (02)
test2
极坐标系
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Cylinder
Set Theory
Ellipse
Root
Ratios