physics help!!!!!!!!!!!!!!!!!!!!!!!!!!!!?

[First L]

The three masses are connected by massless, rigid rods.
a) Find the coordinates of the center of mass. Find the x-coordinate.
b) Find the y-coordinate.
c) Find the moment of inertia about an axis that passes through mass A and is perpendicular to the page.
d) Find the moment of inertia about an axis that passes through masses B and C.
the graph for help found here
http://s204.photobucket.com/albums/bb77/VERLIN_02/?action=view&current=2-8.jpg