Today tried a sample to fetch Area and perimeter of a surface using ArcGIS API with Google maps. It is easy to use, we just need to join the points for the respective surface for which we need to find the Area & perimeter and double click. I always like Central park in Newyork, Thought let us try the tool there... It works perfect... please find the link & screen shot below.
Live Sample: http://www.kuwaitfresh.com/find_area.html