Equilateral Triangle Billiards

You are playing pool on a billiard table which is an equilateral triangle ABC.ABC. The ball is at the center of the triangle, and you hit it in any direction with uniform probability. What is the expected number of sides the ball hits before hitting side AB,\overline{AB}, to 3 decimal places?


Details and Assumptions:

  • The ball bounces off the sides of the table according to the law of reflection.
  • If the first side the ball hits is AB,\overline{AB}, then the number of walls the ball hits before hitting AB\overline{AB} is zero.
  • The ball is infinitesimally small.
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