Driving out in the "Western Plains" states of the U.S. is like being on a flat plane. Three trees are now growing at random points on the plane (or plain). What's the probability they form an obtuse triangle? Assume that two of the trees are a fixed distance 'x' from each other.

Driving out in the "Western Plains" states of the U.S. is like being on a flat plane. Three trees are now growing at random points on the plane (or plain). What's the probability they form an obtuse triangle? Assume that two of the trees are a fixed distance 'x' from each other.

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