Calculate area of certain pixels

Discussion created by IYTE-ARCHITECTURE on Nov 1, 2013
Latest reply on Nov 1, 2013 by Hornbydd
Dear forum members,

Please accept my apology if the same question has already been
posted and answered. I have ASTER GDEM (30 meters resolution)
I simply calculated slope as a percent slope.
  My question
is that how can I calculate the total area of certain pixels. So,
it would be possible to answer questions such as `what is the
total area of  pixels where the slope is higher than 30%.Thank you
in advance

Kind Regards

- Omur Saygin