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證平行四邊形 (對邊相等)
Author:
W.L. Wong, Albert
GeoGebra
New Resources
四邊形的特性
兩位數除以一位數（二）
兩組對邊相等的四邊形
拼砌四邊形
兩位數除以一位數（一）
Discover Resources
可調包絡圓
面積
假的龍珠
Properties of parallelogram(平行四邊形的性質)
面积
Discover Topics
Sequences and Series
Cosine
Quadratic Functions
Division
Normal Distribution