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数学之美-多边形对角线
Author:
张景睿
GeoGebra
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兩組對邊相等和有直角的四邊形
判斷球體
兩位數加法
兩位數除以一位數（一）
找出對稱軸
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三角形的內心
周界
數學傳播39卷4期, 平面幾何公式思考
Triangle on sphere
冰淇淋
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Terms
Variance
Unit Circle
Prism
Surface