The (abbreviated) output that I get for Problem 3 is as follows:

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<pre>
prompt >> java EngineeringProperties

.... details of output omitted ....

Total Area   =       5.86
---------------------------------
Moments of Inertia (about coordinate axes)
   I_xx =     51.840
   I_yy =     51.840
   I_xy =     47.867
Centroid(X)  =       2.84
Centroid(Y)  =       2.84
Moments of Inertia (about centroid)
   I_xx =      4.380
   I_yy =      4.380
   I_xy =      0.408
Orientation of Principal Axes
   Angle =      0.785 radians
   Angle =     45.000 degrees
prompt >> 
</pre>