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圓外切四邊形對邊和等長
Author:
謝易達
GeoGebra
New Resources
球体的体积推导（优化版）
【案例】2018年全国1卷理科12题
兩組對邊相等的四邊形
判斷球體
四邊形的特性
Discover Resources
畫三角形 題3b
T5 Geobra
FHMS Corr Angles on NonParallel Lines
Question 8
Copy of 十行表
Discover Topics
Symmetry
Equilateral Triangles
Means
Complex Numbers
Vectors