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高斯定理：對角線中點共線
Author:
羅驥韡 (Pegasus Roe)
GeoGebra
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近似值：有效數字
畫出對稱圖形
Claude 解幾何題
四邉形 (四年級) 教師版
兩組對邊相等和有直角的四邊形
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費氏螺旋線(配合試算表)
斯霍滕(Schooten)定理(與角平分線定理等價)
正弦定理的验证
外積無結合律
p.8.18
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