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高斯定理：對角線中點共線
Author:
羅驥韡 (Pegasus Roe)
GeoGebra
New Resources
畫出對稱圖形
兩組對邊相等和有直角的四邊形
兩位數除以一位數（一）
四邊形的特性
找出對稱軸
Discover Resources
平行四邊形的面積
mario coin
畢氏定理
Congruent Triangle (ASA)
小车
Discover Topics
Vectors
Planes
Curve Sketching
Functions
Histogram