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Perpendicular lines
Author:
Ng KC
GeoGebra
New Resources
双心四边形
三角函数 的副本
祖冲之的期望：内棋与外棋
科氏力 (Coriolis Force)
第八周作业1
Discover Resources
全等三角形
弧度制的意义
相同圖形的拼砌（有兩組平行線的四邊形）
代入消去法
乘法训练
Discover Topics
Frequency Distribution
Circumcircle or Circumscribed Circle
Standard Deviation
Boxplot
Histogram