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切线长定理
Author:
su
GeoGebra
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美國國旗 (Codex, 2026.10.06)
sanjiaohanshu
畫出對稱圖形
幾何作圖題：切三圓（題目）
Nested spiral octagon
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直角三角形的三角比
[工具箱] 標示長度
数学教学新帮手
題五
折扣 例5的副本
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Conditional Probability
Perimeter
Triangles
Algebra
Tangent Line or Tangent