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2S2 3S3 角的認識 20180305
Author:
makkei
GeoGebra
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垂直線的斜率
圓的基本性質
祖冲之的期望：内棋与外棋
龙形曲线-分形龙2
比較五件物件的重量
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三角形與邊上一點求正三角形
特別角的三角函數值(1)
繡曲線
sin(x) 的函數圖形的副本
weihaoxia
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Special Points
Function Graph
Volume
Upper and Lower Sum or Riemann Sum
Circumcircle or Circumscribed Circle