A plane figure consisting of four points,no three of which are collinear,connected by straight lines.

 
  • 四邊形,四角形由四個(gè)角組成的平面圖形,沒(méi)有任何三個(gè)點(diǎn)共線(xiàn),通過(guò)直線(xiàn)相連接
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