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congruent (AAS) 3
Author:
Ricky Chan
GeoGebra
New Resources
【案例】2013年安徽高考15题
兩位數除以一位數（二）
兩組對邊相等和有直角的四邊形
球體建築師
柱體建築師
Discover Resources
三角形重心軌跡(動點在三圓上)
Question of the shelter
等腰三角形
拋物線3--平行四邊形法
閱讀鐘面及數字鐘（時和分）的副本
Discover Topics
Variance
Straight Lines
Step Functions
Area
Calculus