... to the plane. The projection of any figure on a plane is the locus of the projections of all points of the figure on the plane.Thus, B is the projection of the point A on M, and l2is the projection of ... through A, B, and P . Ax. 2, § 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 ... angle and the two adjacentsides of one are equal respectively to an angle and the two adjacent sides of the other.46. The segment connecting the middle points of the two non-parallelsides of...