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四邊形的特性
Author:
Lam Kam Hong
GeoGebra
New Resources
畫出對稱圖形
球体的体积推导
球体的体积推导（优化版）
四邊形的特性
兩組對邊相等的四邊形
Discover Resources
congruent (SAS)
Locus (What's wrong)
三角形的五心
指令
手拉手模型
Discover Topics
Conic Sections
Kite
Numbers
Standard Deviation
Statistics