Although descriptions using coordinates were rarely used by students in the studies of Ben Haim(1986)and Gaulin(1985), coordinates are frequently employed for two-dimensional representations in mathematic classrooms,especially in the senior high school years. We though it unlikely that high school studens would find it easy to interpret representations based on three dimensional coordinates,whether these were in the form of conventional coordinates or presented as verbal descriptions based coordinates(quasi-coordinate representations). Representations using coordinates must be decoded before the structure can be visualized and , moreover, coordinates in three dimensions are never encountered by many high school students.