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Std ix/x Circle area problem (use pure geomtery no calculus)?

A circular grass field has circumference = 22m. A goat with a rope round the neck is located such that the other end of the rope is hooked to a on a point on the circumference. what should be the length of a rope so that the goat can only graze half the area of the circular field.

additionally web links to similar problems or topic will also help

Update:

http://www.mathpages.com/home/kmath074/kmath074.ht...

one more link to the problem after i read Gianlino's soln

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