Concave polygon - Concave polygon
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A polygon that contains at least one interior angle greater than two right angles (180 degrees). A concave polygon. ⇔ A convex polygon. [English-Japanese Dictionary of Mathematical Terms (1889)] Source: The Selected Edition of the Japanese Language Dictionary About the Selected Edition of the Japanese Language Dictionary Information |
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〘名〙 二直角（一八〇度）より大きい内角を一個以上含む多角形。凹多辺形。⇔凸(とつ)多角形。〔数学ニ用ヰル辞ノ英和対訳字書（1889）〕
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![Kinpo [town] - Kinpo](/upload/images/67cb6503dede9.webp)
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