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向量的面积与内积
Author:
董芮呈
GeoGebra
New Resources
垂直線的斜率
祖冲之的期望：内棋与外棋
平行線的斜率
第八周作业
探究三角形的全等條件
Discover Resources
邊長與三角形（一）
平行四邊形的高
兩正方形重疊的形狀(配合習作40頁)
立體圖形的截面
Copy of 離心率與圓錐曲線
Discover Topics
Geometric Mean
Addition
Constructions
Real Numbers
Histogram