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平行四邊形有甚麼特性？
Author:
Anthony OR 柯志明
Topic:
Parallelogram
English version:
http://ggbtu.be/m79826
GeoGebra
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四邊形的特性
拼砌四邊形
柱體建築師
球體建築師
判斷球體
Discover Resources
高中, 直線與點對稱
Q5-7
二維
遊戲
C60足球模型（序列+旋转）
Discover Topics
Continuity
Complex Numbers
Geometric Transformations
Linear Regression
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