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錯角---垂直平行綫
Author:
chanfushun
GeoGebra
New Resources
兩位數除以一位數（一）
三位數除以一位數（二）
画直线等分三角形的面积
畫出對稱圖形
找出對稱軸
Discover Resources
量度的誤差 Errors in Measurement
平行四邊形和長方形的大小
两平面夹角
生长弧
Cycloid
Discover Topics
Natural Numbers
Piecewise Functions
Secant Line or Secant
Equilateral Triangles
Arithmetic Operations