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圆锥曲线
Author:
冯伟冀
GeoGebra
New Resources
畫出對稱圖形
画直线等分三角形的面积
判斷球體
拼砌四邊形
兩位數除以一位數（一）
Discover Resources
找中點的坐標
正弦函數描點作圖
帕普斯定理：齊次座標
Question 8
移動愛心
Discover Topics
Vectors 2D (Two-Dimensional)
Addition
Trapezoid
Rectangle
Unit Circle