... projection of a point on a plane is the foot of the perpendicular from the point to the plane. The projection of any figure on a plane is the locus of the projections of all points of the figureon the ... through the figure.In the closed box AG, the lines AD, DC, and DH lie behind the figure and are dotted, while the others are in full view and are solid. If the boxwere open at the top, part of the ... 66(2) Let A be the intersection point of l1 and l2, and B and C any other points, one on l1 and the other on l2. Then A, B, and C determine the plane N in which lie l1 and l2. Axs. 2,...