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梯形有甚麼特性？
Author:
Anthony OR 柯志明
English version:
http://ggbtu.be/m79855
GeoGebra
New Resources
畫出對稱圖形
兩位數加法
直角坐標平面上的旋轉變換
兩位數除以一位數（二）
兩組對邊相等的四邊形
Discover Resources
四邊形四個九點圓共點
面積與積分值
Locus (Non parallel lines)
zentangle
变化的三角形的垂心.许兴华数学
Discover Topics
Exponent
Calculus
Stochastic Process or Random Process
Rational Numbers
Statistics