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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
判斷球體
找出對稱軸
直角坐標平面上的旋轉變換
兩組對邊相等和有直角的四邊形
錐體建築師
Discover Resources
Cross sections of cube
橢圓與雙曲線折紙
先估算，後看解釋
半圓五角形滑動
a sin(bx+c) + d 的圖形的副本
Discover Topics
Isosceles Triangles
Triangles
Ratios
Unit Circle
General Quadrilateral