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1. The quadrilateral is a shape with four sides and four angles.
四边形是一种有四个边和四个角的形状。
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2. The quadrilateral was formed by the intersection of two lines.
四边形是由两条线相交形成的。
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3. The quadrilateral has vertices at the points of intersection of the lines.
四边形在两条线的交点处有顶点。