Hi folks --- This is Software Sculptors first crack at DLLs so try not to laugh to hard --- I would appreciate any comments you have though --- please leave it for John Sirabella -- The DLL is called GEO.DLL and I give an example MAK of how it works -- It has some Geometry functions which may or may not be useful -- If there are any additional DLL functions you would like to see write and I will write it -- Included in GEO.DLL 1) Sides - Tells you if the sides you enter for a TRIANGLE make a valid triangle. 2) SemiPer - Tell you the SEMI PERIMITER of the TRIANGLE 3) TrArea - Tell you the AREA of the TRIANGLE Thanxs in Advance John Sirabella