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任務1
Author:
gklwong
Topic:
Triangles
GeoGebra
New Resources
找出對稱軸
直角坐標平面上的旋轉變換
兩組對邊相等和有直角的四邊形
Nested spiral octagon
美國國旗 (Codex 版)
Discover Resources
百分數（小學）：折扣 / 賺賠（HTML5 版）
有向角
dandan
图中的三角形面积何时最小？（许兴华数学）
球体的体积推导
Discover Topics
Combinatorics
Tangent Line or Tangent
Expected Value
Similar Triangles
Parallelogram