point-polygon usage

Hi.

I am trying to determine if some lat/longs stored in a database are
contained within a defined polygon using the very nice builtin operators
and types of postgresql; to wit,

gds2=> select count(*) from master where point '(latitude,longitude)' @
polygon
'(
(3200000,10200000),(3187500,10262500),(3112500,10230000),(3112500,10187500),(3200000,10200000))';

ERROR: Bad point external representation '(latitude,longitude)'
ERROR: Bad point external representation '(latitude,longitude)'

I have tried several variations on this theme to no avail. What am I
doing wrong?

I am using version 6.5.2, latitude and longitude are float.

Thank you for your help.

Don Isgitt