Calculating the magnetic field of 3 piece wire (1 Viewer)

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Okay I need some verification that I did this problem right. If not then please tell me where I went wrong.

Given a long wire going into the page with current also going in the same direction and then making a half-circle arc along the plane of the paper to the left, and finaly conituing to make a straight wire. Find the magnetic field at P which is at the center of the arc (center of circle if the arc were a full circle). I'm given the radius of the arc and the current.

i=5.78A
R=.0789m
I used phi=Pi
I attached the formula I used and a poor drawing of what the wire looks like.

segment.View attachment arc.doc

I got 1.14X10^-4T
 

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