2.0 Cartesian Plane Quadrants and Coordinates In 2D geometry, the origin or the point of intersection separates the Cartesian plane into four regions called the Cartesian plane quadrants, referred to as Quadrants I, II, III, and IV. Learn all four quadrants of a coordinate system. The plane of the graph paper is divided into four regions by the coordinate axes and the four regions are called quadrants. The four quadrants The coordinate axes divide the plane into four quadrants, labelled first, second, third and fourth as shown. Angles in the third quadrant, for example, lie between \ (180^\circ\) and \ (270^\circ\). By considering the \ (x\)- and \ (y\)-coordinates of the point \ (P\) as it lies in each of the four quadrants, we can identify the sign of each of the trigonometric ratios in a given quadrant. These are summarised in the following diagrams. Detailed description of diagram In ... We will learn more about the four quadrants of a coordinate system in this article, as well as how to plot and locate points in each quadrant.
