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高斯定理：對角線中點共線
Author:
羅驥韡 (Pegasus Roe)
GeoGebra
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三位數除以一位數（一）
兩組對邊相等和有直角的四邊形
找出對稱軸
四邊形的特性
判斷球體
Discover Resources
UpdateConstruction
invariance interval
外心
雙曲線2--焦點法
S3 Ex4.3 Q05(3D圖)
Discover Topics
Derivative
Geometric Transformations
Orthocenter
Trigonometric Functions
Statistical Characteristics