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Locus (What's wrong)
Author:
Lttcmooc
GeoGebra
New Resources
拼砌四邊形
第八周作业
四邊形的特性
兩組對邊相等和有直角的四邊形
球体的体积推导（优化版）
Discover Resources
彈道
補角關係
空間中兩向量夾角
封閉圖形的斜線區域
area 面積4
Discover Topics
Constructions
Rectangle
Trapezoid
Linear Programming or Linear Optimization
Circumcircle or Circumscribed Circle