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Illusion-外凸的正方形
Author:
王彤
GeoGebra
New Resources
四邊形的特性
兩組對邊相等和有直角的四邊形
畫出對稱圖形
画直线等分三角形的面积
球体的体积推导（优化版）
Discover Resources
ladder
十分位分數
動畫基本滑桿
HKDSE 2016 by Mr LO WY
直线过定点问题(1)
Discover Topics
Probability
Optimization Problems
Tangent Function
Rhombus
Linear Equations