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zuiduan
Author:
luodeqin@keleshuxue.com
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球体的体积推导
兩組對邊相等和有直角的四邊形
畫出對稱圖形
拼砌四邊形
找出對稱軸
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圓柱切割
內心
诱导公式六(90°-α)
雙曲線代數性質,光學性質
动圆与两圆外切与内切(1)
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Kite
Quadrilaterals
Terms
Equilateral Triangles
Numbers