quadrilateral
plural of nonsphere
A polygon with four sides. / An area defended by four fortresses supporting each other.
(rhetoric) A figure by which permission is either seriously or ironically granted to someone to do what he or she proposes to do, e.g. He that is unjust, let him be unjust still.
Belonging to the Rhizocarpeae, a former taxonomic group of cryptogams.
生徒たちは周囲を計算するために四辺形の各辺を測定した。
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