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过圆上一点作切线，三步
Author:
u.jianwang
GeoGebra
New Resources
畫出對稱圖形
兩組對邊相等的四邊形
算柱 (兩位數)
四邉形 (四年級) 教師版
第八周作业
Discover Resources
二項分布與抽樣
內心
正三角形內一點到三頂點的距離
consistent equation 3x3
相似形的應用
Discover Topics
Plane Figures or Shapes
Prism
Upper and Lower Sum or Riemann Sum
Area
Numbers