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In a Cartesian coordinate system, the plane is divided into four quarters, or regions, by two axis which are vertical to each other. These axis are better known as the X and Y axis.
The regions are designated I, II, III, IV starting from the positive, positive region (both values of X and Y are positive) - region I, clockwise.
Region II is the region where coordinates are below the X-axis (negative) and right of the Y-axis (positive).
Region III is the region where both X and Y values are negative.
Region IV is the region where X values are positive and Y values are negative.
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