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等腰直角三角形与双垂直
Author:
林峰
GeoGebra
New Resources
平行線的判定
异形操场
斐波那契螺旋弧线（表格法）
第八周作业1
第八周作业
Discover Resources
內切圓滾動
選擇合適的「中間人」
熊大
桁架圖解步驟
任意角的三角函数
Discover Topics
Subtraction
Circumcircle or Circumscribed Circle
Addition
Sine
Trigonometry