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反正切函數
Author:
chungYT
GeoGebra
New Resources
兩組對邊相等和有直角的四邊形
【案例】圆柱体内放置一个大球六个小球
四邉形 (四年級) 教師版
兩位數除以一位數（一）
兩組對邊相等的四邊形
Discover Resources
tessellation design
證平行四邊形 (對角線互相平分) (對邊 // 且相等)
tytyty
兩橢圓交集
赵爽弦图
Discover Topics
LCM and GCD
Geometric Transformations
Boxplot
Orthocenter
Division