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<p>one of the coordinate curves is reduced to a single point, the origin, which is often viewed as a circle of radius zero. Similarly, spherical and cylindrical coordinate systems have coordinate curves that are lines, circles or circles of radius zero.</p>

<p>Many curves can occur as coordinate curves. For example, the coordinate curves of <a href="page.php?w=parabolic_coordinates">parabolic coordinates</a> are <a href="page.php?w=parabola">parabola</a>s.</p>

<p><big>Coordinate planes/surfaces</big></p>
<p>In three-dimensional space, if one coordinate</p><p>
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