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證平行四邊形 (對角線互相平分) (對邊 // 且相等)
Author:
W.L. Wong, Albert
GeoGebra
New Resources
Nested spiral octagon
找出對稱軸
Earth with coastline
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
Discover Resources
Translation, Reflection and Rotation
二次函數中參數對圖形的影響
Triangle
四角柱算體積(可以切開)
正方形推垛
Discover Topics
Differential Calculus
Geometric Distribution
Line Segment
Equilateral Triangles
Orthocenter