What is the most efficient way to cover (not literally cover) a circular area?

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All of the questions I found are about literally covering "What is the most effective way to cover a circular pot with a square lid etc..." Here's an example to show what I mean: I have a circular farm of 10,000 sq m in area. I have a crop duster that can cover a ten meter wide area (10 meter wingspan) while traveling in a line. How would I determine the most efficient flight path to crop dust my farm while using as little fuel as possible? Should I spiral inwards? Fill the outer circle, then move in for concentric, separate circles? Make a sun-beam-like motion back and forth from the center? This could also be applied to patroling a security area, sweeping a circular room, etc. Would it always be the same, regardless of wingspan and area size?