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-3/2 ≤ cosα + cosβ + cosγ ≤ 3
Author:
羅驥韡 (Pegasus Roe)
GeoGebra
前提：α + β + γ = 0
New Resources
Earth with coastline
兩組對邊相等的四邊形
近似值：有效數字
畫出對稱圖形
判斷球體
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Gradient of tangent
柱體頂棱
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