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三垂線
Author:
Wu Xiao-Ren
GeoGebra
New Resources
活动三：应用性质
盈利與虧蝕
第三周作业效果演示
斐波那契螺旋弧线（表格法）
斐波那契螺旋弧线（表格法-可动态调节）
Discover Resources
kevin
pictures
中學(高中)
與三個半圓相切之圓的填滿
追击问题
Discover Topics
Circumcircle or Circumscribed Circle
Square
Perimeter
Cuboid
Conic Sections