\begin{definition}[Definition:Cartesian Plane/Quadrants/Fourth]
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Quadrant $\text{IV}: \quad$ The area below the $x$-axis and to the right of the $y$-axis is called '''the fourth quadrant'''.
That is, '''the fourth quadrant''' is where the $x$ coordinate of a point is positive and the $y$ coordinate of a point is negative.
\end{definition}