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劉虹圻 垂心
Author:
呂麗珠
Topic:
Orthocenter
GeoGebra
New Resources
異分母分數減法
判斷球體
球体的体积推导（优化版）
第八周作业
算柱 (兩位數)
Discover Resources
Addition and Subtraction of Directed Numbers (1) 有向數加減(1)
餘弦定理的圖形證明2
正四面體與正八面體
三圓外切
錯角---水平平行綫
Discover Topics
Similar Triangles
Definite Integral
Optimization Problems
Arithmetic Mean
Fractions