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# 9.12: Circles in the Coordinate Plane

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

Distance Formula

Distance Formula

The distance between two points $(x_1, y_1)$ and $(x_2, y_2)$ can be defined as $d= \sqrt{(x_2-x_1)^2 + (y_2-y_1)^2}$.
Origin

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).

Jul 17, 2012

Feb 26, 2015