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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
New Resources
画直线等分三角形的面积
兩組對邊相等的四邊形
球体的体积推导
兩組對邊相等和有直角的四邊形
柱體建築師
Discover Resources
K9@cn
空間中的平面
example
廣義三角：tan
正方形折纸减去两角
Discover Topics
Sequences and Series
Histogram
Triangles
Confidence Interval
Set Theory