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任意三角形外心與外接圓
Author:
郭逸民
GeoGebra
New Resources
兩位數加法
三位數除以一位數（一）
拼砌四邊形
異分母分數減法
判斷球體
Discover Resources
內輪差...
面積3
Drag C and see
sin(x) 的函數圖形的副本
动圆与两(相离)圆外切
Discover Topics
Surface
Rhombus
Quadrilaterals
Tangent Function
Parametric Curves