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大十字
Author:
陳柄何
GeoGebra
New Resources
三角函数 的副本
常见四边形是否是双心四边形
折扣
空间中两直线的位置关系
祖冲之的期望：内棋与外棋
Discover Resources
Angle between Lateral Faces 2
Locus (Segment)
三角形的五心
三视图
球面截痕
Discover Topics
Linear Programming or Linear Optimization
Linear Equations
Volume
Tangent Line or Tangent
Sine