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祖冲之的期望：内棋与外棋
Author:
孟宝兴
GeoGebra
New Resources
兩組對邊相等和有直角的四邊形
三位數除以一位數（二）
兩位數除以一位數（二）
拼砌四邊形
画直线等分三角形的面积
Discover Resources
Task 2 Equilateral Triangle
轉盤送分遊戲
congruent (SSS)
繡曲線
三角形点阵
Discover Topics
Cuboid
Boxplot
Geometric Transformations
Matrices
Differential Equation