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同旁內角---垂直平行綫
Author:
chanfushun
GeoGebra
New Resources
長方體平面投影 (Codex版)
美國國旗 (Claude 版)
Nested spiral octagon
Earth with coastline
國旗 (Claude 版)
Discover Resources
簡易文氏圖
電子幾何條（2014）
glt-h02-07 直角三角柱柱展開
相同圖形的拼砌（有兩組平行線的四邊形）
如何平移逼近三点的抛物线
Discover Topics
LCM and GCD
Functions
Parallelogram
Algebra
Boxplot