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# 11.15: Polygon Classification in the Coordinate Plane

Difficulty Level: At Grade Created by: CK-12
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### Vocabulary Language: English

$x-$axis

The $x-$axis is the horizontal axis in the coordinate plane, commonly representing the value of the input or independent variable.

$y$ axis

The $y$-axis is the vertical number line of the Cartesian plane.

Coordinates

The coordinates of a point represent the point's location on the Cartesian plane. Coordinates are written in ordered pairs: $(x, y)$.

Ordered Pair

An ordered pair, $(x, y)$, describes the location of a point on a coordinate grid.

Origin

The origin is the point of intersection of the $x$ and $y$ axes on the Cartesian plane. The coordinates of the origin are (0, 0).

A quadrant is one-fourth of the coordinate plane. The four quadrants are numbered using Roman Numerals I, II, III, and IV, starting in the top-right, and increasing counter-clockwise.

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