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三角形的外心
Author:
侯杰材
GeoGebra
New Resources
算柱 (兩位數)
兩組對邊相等的四邊形
兩位數除以一位數（一）
柱體建築師
【案例】2018年全国1卷理科12题
Discover Resources
餘弦定理
曲柄搖桿
trapezoid2
congruent (SAS)
雙曲線的副本
Discover Topics
Standard Deviation
Combinatorics
Statistics
Vectors 2D (Two-Dimensional)
Circle