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正弦定理的证明
Author:
梁航宇
GeoGebra
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画直线等分三角形的面积
兩組對邊相等和有直角的四邊形
【案例】2018年全国1卷理科12题
兩位數除以一位數（一）
異分母分數減法
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Sum of Exterior Angles of Polygons 多邊形外角和
Is this a prism 7
正多角柱(簡易)
Copy of 圓周公式應用題1
Regular Tetrahedron
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Incircle or Inscribed Circle
Correlation
Percentages
Exponential Functions
Trigonometry