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反正切函數
Author:
chungYT
GeoGebra
New Resources
柱體建築師
画直线等分三角形的面积
四邊形的特性
三位數除以一位數（一）
兩組對邊相等和有直角的四邊形
Discover Resources
excenter of triangle
線性規劃
Quiz on Rotation 旋轉變換：測驗
GGB報告
美麗的地球
Discover Topics
Geometric Distribution
Reflection
Trapezoid
Exponent
Power Functions