In learner-centred methods, the teacher/instructor is both a teacher and a learner at the same time. In the words of Lawrence Stenhouse, the teacher plays a dual role as a learner as well âso that in his classroom extends rather than constricts his intellectual horizonsâ.
Two-point perspective has one set of lines parallel to the picture plane and two sets oblique to it. Parallel lines oblique to the picture plane converge to a vanishing point, which means that this set-up will require two vanishing points. Walls in 2-point perspective, converging toward two vanishing points.
1 If two angles form a linear pair, then they are supplementary; that is, the sum of their measures is 180 degrees. (page 90)  Parallel Postulate. If there is a line and a point not on the line, then there is exactly one line through the point parallel to the given line.