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正弦定理
Author:
yuchengda
GeoGebra
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兩組對邊相等和有直角的四邊形
第八周作业
四邉形 (四年級) 教師版
畫出對稱圖形
找出對稱軸
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最短
摺紙模板
gjc097a29 重心
平行四邊形面積的副本
勒洛四面体（参数曲面法）
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Hyperbola
Interest Calculation
Linear Regression
Ratios
Linear Programming or Linear Optimization