1.
diagonal line of a complete quadrilateral
完全四边形的对角线
2.
Having four sides and four angles;square or rectangular.
四边形的带有四条边或四个角的；长方形或正方形的
3.
The base of the triangle coincides with one side of the square.
这三角形的底边与这四边形的一边相重合。
4.
a prismatoid whose bases are polygons having the same number of sides and whose other faces are trapezoids or parallelograms.
每个底部是边数相同的多面形且其它面是不等边四边形或平行四边形的旁面三角台。
5.
A plane figure with four sides and four angles.
四边形有四个边和四个角的平面图形
6.
A quadrilateral having no parallel sides.
没有平行边的四边形
7.
a parallelogram with four equal sides; an oblique-angled equilateral parallelogram.
四个边相等的平行四边形；不是直角的等边平行四边形。
8.
A quadrilateral having two parallel sides.
梯形一个有两条平行边的四边形
9.
A trapezoid is a quadrilateral with two parallel sides.
梯形是具有两平行边的四边形。
10.
diagonal point of a complete quadrangle
完全四角形的对边点
11.
primitive parallelogram of period
周期的原始平行四边形
12.
The sides of a square.
一个四方形的各边。
13.
A four - sided plane figure with four right angles.
矩形，长方形具有四个边的方形，有四个直角
14.
a quadrilateral whose opposite sides are both parallel and equal in length.
相对的边平行且长度相等的四边形。
15.
(in US) a quadrilateral with no parallel sides.
（在美国）没有平行边的四边形。
16.
(in US) a quadrilateral with two parallel sides.
（在美国）有两个平行边的四边形。
17.
a polyhedron whose faces are trapeziums.
由不等边四边形面组成的多面体。
18.
B： Yes, it is. A rectangle has four sides and four corners.
是的。长方形有四条边和四个角。