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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
sanjiaohanshu
兩組對邊相等和有直角的四邊形
直角坐標平面上的旋轉變換
球體建築師
Nested spiral octagon
Discover Resources
國中數學
拋射問題
General Form of Quadratic Functions(2) 二次函數的圖像：一般式(2)
面積
变化的三角形的垂心.许兴华数学
Discover Topics
Intersection
Square
Constructions
Arithmetic Operations
Prism