This topic is still under development on wolframalpha and I've read some resources from wiki, youtube and yahoo answers and my basic understanding as of current is..
1st moment of area is area multiplied by the perpendicular distance from the point of line of action. 2nd moment of an area or moment of inertia is the moment of all small areas dA about any axis.
And I was wondering whether someone could give me some more information/examples on first and second moment of area (tech calculus, wouldnt let me add a new tag).
I'll bring the formula I'm trying to understand on this question tomorrow..