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-3/2 ≤ cosα + cosβ + cosγ ≤ 3
Author:
羅驥韡 (Pegasus Roe)
GeoGebra
前提：α + β + γ = 0
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Earth with coastline
sanjiaohanshu
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兩組對邊相等和有直角的四邊形
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不規則區域著色
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Area
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Rectangle
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