I'm not sure what you are asking here, but at the centre of a soccer field is a centre or half way line and a circle with a 9.15m (10 yard) radius.
For more details, check out - http://en.wikipedia.org/wiki/Image:Football_pitch_metric.svg
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A soccer field contains rectangles, circles, arcs, and sectors (parts of a circle enclosed by an arc and two radii). In addition, other shapes may be found on the corner flags, goal posts and crossbar (which may be elliptical), and the netting of the goal.