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Angle in the same segment
Author:
Big Lee
GeoGebra
New Resources
兩位數加法
拼砌四邊形
找出對稱軸
四邉形 (四年級) 教師版
三位數除以一位數（一）
Discover Resources
Simultaneous Linear Equations 聯立二元一次方程
Quiz on Solving Right Triangles (Finding Angles) 解直角三角形：測驗2（求角度）
正三角形
Similar triangles reasons
伽利略比值II (Alfinio Flores & Hugh A. Sanders)
Discover Topics
Tree Diagrams
Geometric Mean
Median Value
Fractal Geometry
Binomial Distribution