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<p>and vice versa; this is the basis of <a href="page.php?w=analytic_geometry">analytic geometry</a>.</p>

<p><big>Common coordinate systems</big></p>
<p><big>Number line</big></p>
<p> The simplest example of a coordinate system in one dimension is the identification of points on a <a href="page.php?w=line_%28geometry%29">line</a> with real numbers using the <a href="page.php?w=number_line">number line</a>. In this system, an arbitrary point O (the origin) is chosen on a given line. The coordinate of a point P is defined as the signed distance from O to P, where</p><p>
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