The Science of Living Things series demonstrates that Bobbie Kalman and her staff have turned out yet another informative and finely produced series of books. . . . this whole series would make a welcome addition to the elementary school library -- Kay Lehr, Fort Rouge School, Manitoba, Jan. 1999.
perpendicularity - the quality of being at right angles to a given line or plane (especially the plane of the horizon) oblongness, rectangularity - the property of being shaped like a rectangle.
The implementation of perpendicularity in manufacturing and measuring is never perfect and is assessed as achieving a greater or lesser degree of perpendicularity. The most common method to inspect for perpendicularity is to compare the part to a master square.