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正方形和長方形有甚麼特性？
Author:
Anthony OR 柯志明
GeoGebra
New Resources
兩組對邊相等的四邊形
三位數除以一位數（一）
【案例】圆柱体内放置一个大球六个小球
球体的体积推导
找出對稱軸
Discover Resources
中點軌跡(動點在兩圓上)
第14題
滑桿動畫示範-2
翰林卷第10题
認識菱形的特徵
Discover Topics
Conic Sections
Combinatorics
Symmetry
Quadrilaterals
Limits