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固定周界的長方形的面積變化（周界是200厘米）
Author:
李寶玲
,
GeoGebra Institute of Hong Kong
GeoGebra
New Resources
兩組對邊相等和有直角的四邊形
球體建築師
四邊形的特性
三位數除以一位數（一）
拼砌四邊形
Discover Resources
animation for kastin
moon
任意三角形
橢圓軌跡
分数的乘法
Discover Topics
Probability
Vectors 3D (Three-Dimensional)
Rational Numbers
Right Triangles
Congruence