The standard form of a circle is 
, where h and k are the coordinates of the center and r is the radius. We will fill in accordingly with what we have. 
. Simplifying a bit we have 
. That's the equation for your circle.
(2/5-1/2)+3/5 . [7/2-3/5÷(1/4-1/5)]
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Not much can be done without knowing what 
is, but at the least we can set up the integral.
First parameterize the pieces of the contour:
where
and 
. You have
and so the work is given by the integral
First parameterize the pieces of the contour:
where
and so the work is given by the integral