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錯角---不平行綫
Author:
chanfushun
GeoGebra
New Resources
算柱 (兩位數)
第八周作业
兩組對邊相等的四邊形
三位數除以一位數（二）
兩位數除以一位數（一）
Discover Resources
斜線圖的畫法
眼球定理
圖形的周界
Rotation of line
翰林數學_2下_CH3-1_三角形的外角定理
Discover Topics
Conic Sections
Natural Numbers
General Quadrilateral
Tangent Line or Tangent
Pythagoras or Pythagorean Theorem