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三角四星
Author:
吳秉沂
GeoGebra
New Resources
四邊形的特性
第八周作业
兩組對邊相等和有直角的四邊形
四邉形 (四年級) 教師版
三位數除以一位數（二）
Discover Resources
反餘弦函數
Introduce tangent ratio
congruent activity
捷徑問題
切線性質B
Discover Topics
Equations
Vectors 2D (Two-Dimensional)
Percentages
Sine
Geometric Mean