CFLib.org – Common Function Library Project

Description:
Calculates the surface area of a torus (3D donut shape).

Return Values:
Returns a simple value.

Example:

<CFSET MajorRadius=12>
  <CFSET MinorRadius=3>
  <CFOUTPUT>
  Given:
  <UL>
  <LI>MajorRadius=#MajorRadius#
  <LI>MinorRadius=#MinorRadius#
  </UL>
  The surface area of the torus is #SurfaceAreaTorus(MajorRadius, MinorRadius)#
  </CFOUTPUT>

Parameters:

Full UDF Source:

/**
 * Calculates the surface area of a torus.
 * 
 * @param MajorRadius      1/2 the diameter of the large circle. 
 * @param MinorRadius      1/2 the diameter of a cross-section. 
 * @return Returns a simple value. 
 * @author Rob Brooks-Bilson (rbils@amkor.com) 
 * @version 1.0, July 18, 2001 
 */
function SurfaceAreaTorus(MajorRadius, MinorRadius)
{
  Return (4 * Pi()^2 * MajorRadius * MinorRadius);
}