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垂心(劉虹圻623)
Author:
呂麗珠
Topic:
Orthocenter
GeoGebra
New Resources
算柱 (兩位數)
柱體建築師
兩組對邊相等和有直角的四邊形
找出對稱軸
四邊形的特性
Discover Resources
複合棒形圖: 圖一
ghseh 二次函數動畫左右平移
定周长的正多边形面积变化规律（含圆）
arithmetic operation
生长的海螺
Discover Topics
Plane Figures or Shapes
Dilation
Scalene Triangles
Secant Line or Secant
Derivative