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內心
Author:
詠甯
GeoGebra
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四邊形的特性
兩位數加法
柱體建築師
【案例】圆柱体内放置一个大球六个小球
球體建築師
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垂直平分線
雙曲線的平移
Locus: P equidistant from two fixed points
劉虹圻 內心
图中的三角形面积何时最小？（许兴华数学）
Discover Topics
Equilateral Triangles
Tangent Line or Tangent
Subtraction
Correlation
Pythagoras or Pythagorean Theorem