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證平行四邊形 (對角相等)
Author:
W.L. Wong, Albert
GeoGebra
New Resources
找出對稱軸
兩組對邊相等和有直角的四邊形
兩位數除以一位數（二）
四邊形的特性
直角坐標平面上的旋轉變換
Discover Resources
T,N,B vectors of space curve.
HKCEE-AM 2010 Q17 additional part
Locus (Two points 2)
橢圓的副本
椭圆的离心率
Discover Topics
Histogram
Geometric Mean
Parabola
Exponential Functions
Linear Programming or Linear Optimization