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Angle Between a Line and a Plane Definition 線與平面的交角 定義
Author:
Steven S. H. Chu
GeoGebra
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直線的斜率
探究三角形的全等條件
祖冲之的期望：内棋与外棋
画直线等分三角形的面积
多邊形的面積
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Geometry: Plane Figures (幾何： 平面圖像)
rotational symmetry_2
圓周率的應用 題B
-3/2 ≤ cosα + cosβ + cosγ ≤ 3
折正五邊形
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Set Theory
Rhombus
Conditional Probability
Triangles
Sine