Angular momentum in a particle system (1 Viewer)

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Figure 11-26 shows three particles of the same mass and the same constant speed moving as indicated by the velocity vectors. Points a, b, c, and d form a square, with point e at the center. Rank the points according to the magnitude of the net angular momentum of the three-particle system when measured about the points, greatest first (use only the symbols > or =, for example a>b>c=d=e).

http://files.upl.silentwhisper.net/upload5/phyprob.GIF [Broken]


Okay, so angular momentum is equal to mass (radius cross product velocity). Since velocity is constant and the mass is the same, this leads only the radius or distance to compare. However, I am not quite sure how I should judge the distance of the particles. I mean what is the origin or the reference point that should use to judge these particles from?
 
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Astronuc

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Perhaps label each ball with 1, 2, 3 and decide which balls contribute the angular momentum with respect to each point, a, b, c, d, e.
 

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