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正弦定理验证
Author:
junfeilx
GeoGebra
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四邊形的特性
柱體建築師
球體建築師
画直线等分三角形的面积
異分母分數減法
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chap. 1 by ck
Rotational and reflectional symmetry of a regular polygon
計算圖形周界（小六下）
二倍角的正切公式的证明
S3 Ch4.1 正四面體的反射平面
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Plane Figures or Shapes
Unit Circle
Rhombus
Planes