有关坐标

coordinate system           坐标系?

rectangular coordinate      直角坐标系?

origin                      原点

abscissa                    横坐标?

ordinate                    纵坐标?

number line                 数轴?

plane geometry              平面几何?

trigonometry                三角学?

bisect                      平分?

intersect                   相交?

perpendicular               垂直?

multilateral                多边的