This document discusses the projection of a line that is inclined to both the horizontal and vertical planes in orthographic projections. It explains that when a line is inclined to the horizontal plane, its length in the vertical plane remains constant and the distance between its end points in the front view remains constant. Similarly, when a line is inclined to the vertical plane, its length in the front view remains constant and the distance between its end points in the top view remains constant. Finally, it concludes that when a line is inclined to both planes, these properties apply simultaneously in the two projections.