A trapezoid is a quadrilateral with two parallel sides . 梯形是具有两平行边的四边形。
Squares with tapered and parallel sides for valves for shipboard use 船上阀用带有锥形和平行面的直角器
Hobs for parallel side splines 矩形花键滚刀
The perpendicular distance from the base of a geometric figure to the opposite vertex , parallel side , or parallel surface 顶垂线,高线从一个几何形体的底边到相对的顶点、平行边或平行面的垂直距离
The determinant of a matrix m ( whose magnitude is the area or volume of the parallel sided region determined by its columns or rows ) 矩阵m的行列式值(其大小为由矩阵的行或是列所决定出的平行区域的面积或体积) 。