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Introduce tangent ratio
Author:
VCChung
GeoGebra
New Resources
直角坐標平面上的旋轉變換
兩組對邊相等的四邊形
畫出對稱圖形
【案例】2013年安徽高考15题
兩位數除以一位數（二）
Discover Resources
中央極限定理
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讀量杯上的刻度 (練習)
指數與對數
把三角形分類 的複本
Discover Topics
LCM and GCD
Exponent
Statistical Characteristics
Geometric Transformations
Vectors 2D (Two-Dimensional)