A running track consists of two straight 88.5m segments and two semicircles of radius 39.0m as shown in the figure.

Question

Part A was finding the distance a runner travels in one complete lap. d= 422 m. No problem.
Then part B asks for the displacement in x, y components of a runner that runs half a lap like shown in the figure given. Initially my logic was 2x3.14x39 to find the circumference of the complete circle, which was 245 m. That would be the distance from the origin to point A. (0, 245) From origin to point B would be 88.5 m. (88.5, 0) Total distance traveled from A to B came out to be 211 m. (which covered a straight 88.5 segment and 1 semi circle for visual) I tried final minus initial displacement and got -34. But any of the various x.y coordinates I've put in using this number and others has been wrong. This is how we're supposed to go about doing this problem or am I just completely going about it wrong?
-Thanks, hope this makes sense.