A horse is tied at a point on the circumference of a circular grass field of radius r, by a rope with length L.

What is the length of the rope, in terms of r, so the horse can eat exactly half of the grass field?

(In reply to solution by Daniel)

Daniel, if L < r, intuitively we see that the horse eats less than half of the field.

Posted by pcbouhid on 2008-06-15 23:02:41