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餘弦定理修正項及風車證明
Author:
薛鈞聰
GeoGebra
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四邊形的特性
三位數除以一位數（二）
画直线等分三角形的面积
畫出對稱圖形
【案例】圆柱体内放置一个大球六个小球
Discover Resources
平面幾何
Task 2 Equilateral Triangle
fsfafasfas
李樂雯_尋找PI的活動
鉛筆畫圓
Discover Topics
Plane Figures or Shapes
Trigonometric Functions
Equilateral Triangles
Means
Arithmetic Mean