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4-矩形折叠（翻折问题）
Author:
龚洪萍
Topic:
Congruence
,
Geometry
GeoGebra
New Resources
圓的基本性質
龙形曲线-分形龙2
撒针估算面积实验
科氏力 (Coriolis Force)
直線的斜率
Discover Resources
雙曲線尺規作圖01
正餘弦函數的疊合之二102.11.29
Special Lines & Centres of Triangles 三角形的特殊線和中心
正三角形
串珠
Discover Topics
Correlation
Pyramid
Mode
Pythagoras or Pythagorean Theorem
Linear Equations