The shear changed the quadrilateral into a parallelogram .

四边形被剪成了平行四边形。

Characteristic teaching designs the peculiar quadrilateral .

特殊四边形特征教学设计。

A quadrilateral having no parallel sides .

没有平行边的四边形。

Three grades first volume quadrilateral cognition exercise .

三年级上册四边形的认识练习题.

A quadrilateral having two parallel sides .

梯形一个有两条平行边的四边形。