PostgreSQL radius() Function
The PostgreSQL radius() function to extract the radius of the specified circle.
If you want to get the radius of a circle, use the diameter() function.
radius() Syntax
This is the syntax of the PostgreSQL radius() function:
radius(circle) -> double precision
Parameters
circle-
Required. A circle. For example:
circle '<(0,0),2>'.
Return value
The PostgreSQL radius() function returns the radius of the specified circle.
radius() Examples
The following statement shows how to use the PostgreSQL radius() function to return the radius of the circle circle '<(0,0),2>.
SELECT radius(circle '<(0,0),2>');
radius
--------
2