How to calculate the number of pixels

Discussion created by quangminh1803 on May 2, 2012
Latest reply on May 7, 2012 by JSwain-esristaff
I have two layers, one is the flood area in raster format, the other is flow direction in polygon (vector format). Would you please show me how to calculate the area of flood in each polygon of flow direction?  Or how can I calculate the number of pixel in each polygon.
Thank you so much. I am looking forward to getting your help.