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PostgreSQL documentation

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<entry><literal><function>circle</function>(<type>point</type>, <type>double precision</type>)</literal></entry>

<entry><type>circle</type></entry>

<entry>point and radius to circle</entry>

<entry>center and radius to circle</entry>

<entry><literal>circle(point '(0,0)', 2.0)</literal></entry>

</row>

<row>

<entry>polygon to path</entry>

<entry><literal>path(polygon '((0,0),(1,1),(2,0))')</literal></entry>

</row>

<row>

<entry><literal><function>point</function>(<type>double

precision</type>, <type>double precision</type>)</literal></entry>

<entry><type>point</type></entry>

<entry>construct point</entry>

<entry><literal>point(23.4, -44.5)</literal></entry>

</row>

<row>

<entry><literal><function>point</function>(<type>box</type>)</literal></entry>

<entry><type>point</type></entry>

<entry>center of box</entry>

<entry><literal>point(box '((-1,0),(1,0))')</literal></entry>

</row>

<row>

<entry><literal><function>point</function>(<type>circle</type>)</literal></entry>

<entry><type>point</type></entry>

<entry>center of circle</entry>

<entry><literal>point(circle '((0,0),2.0)')</literal></entry>

</row>

<row>

<entry><literal><function>point</function>(<type>lseg</type>)</literal></entry>

<entry><type>point</type></entry>

<entry>center of lseg</entry>

<entry><literal>point(lseg '((-1,0),(1,0))')</literal></entry>

</row>

<row>

<entry><literal><function>point</function>(<type>lseg</type>, <type>lseg</type>)</literal></entry>

<entry><type>point</type></entry>