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固定周界的矩形
Author:
何穎軒
GeoGebra
New Resources
拼砌四邊形
算柱 (兩位數)
畫出對稱圖形
柱體建築師
三位數除以一位數（二）
Discover Resources
齊來製作對稱圖
Parallel lines (angle of inclination and slope) v2
Angle in the same segment
美麗的花
动圆与两圆外切与内切(1)
Discover Topics
Function Graph
Vectors 3D (Three-Dimensional)
Combinatorics
Division
Similar Triangles