Jan standing at a stationary point directly in front of the center of a bull's eye, aims two arrows at the bull's eye. The first arrow hits one point on the edge of the bull's eye while the second strikes the center of the bull's eye. Jan knows that the second arrow traveled 20 meter distance since he knows where he is from the target. Assuming the bull's eye to be circular of radius 4 meters, how far did the first arrow travel? Neglect gravitational force.

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