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 Related Terms
 Half-plane:  The portion of a plane on one side of a line extending on the plane.
Plane: One of the basic undefined terms of geometry. A plane goes on forever in all directions (in two-dimensions) and is "flat" (i.e., it has no thickness).
Axis: A reference line used in a graph or coordinate system.
Quadrant: One of the four regions on a Coordinate plane formed by the intersection of the x-axis and the y-axis.
x-axis: The horizontal number line on the Cartesian coordinate plane.
y-axis: The vertical number line on the Cartesian coordinate plane.