You are in a square forest of side 100km. You are 2km away from its border, but you don’t know in what direction or at what angle (It could be at 2km with an angle of 16.123 degree for example.) You need to exit the forest, but you can walk a maximum of 13km. What path do you follow ?
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Click the link to view an example of a path shorter than 13 km.
