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Triangle
Author:
Ku, Yin Bon (Albert)
GeoGebra
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球体的体积推导
兩組對邊相等的四邊形
四邉形 (四年級) 教師版
画直线等分三角形的面积
【案例】2018年全国1卷理科12题
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對角線
geo123
Scheimpflug image
正方形周界
鉛筆畫圓
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Reflection
Similarity Transformation or Similarity
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Orthocenter
Sphere