Regarding r and sign convention for Position vectors for moments

1. The problem statement, all variables and given/known data

3. The attempt at a solution

I’m having trouble understanding how r1 = -1.5j and r2= r3 = 0.

Can anyone make this a little clearer for me? I’ve spent quite a while trying to wrap my head around it but to no avail.

http://ift.tt/1kN3DW0

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