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垂足三角形
Author:
孟宝兴
垂足三角形
GeoGebra
New Resources
兩位數加法
四邉形 (四年級) 教師版
柱體建築師
球体的体积推导（优化版）
拼砌四邊形
Discover Resources
(正)長方體
Euler Line 1
量筒
ｃｉｒｃｌｅ ｓｅｇｍｅｎｔ
大園寶
Discover Topics
Special Points
Rectangle
Numbers
Similarity Transformation or Similarity
Mode