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诱导公式四（原点对称关系）
Author:
桃篮翁
GeoGebra
New Resources
四邉形 (四年級) 教師版
美國國旗 (Codex 版)
國旗 (Claude 版)
國旗 (作圖步驟直接餵給 Claude)
直角坐標平面上的旋轉變換
Discover Resources
林書豪加油
複雜的解法
Primary School Geo
Centroid
小四_分數
Discover Topics
Piecewise Functions
Median Line
Translation
Equilateral Triangles
Pythagoras or Pythagorean Theorem