circle_distance_test:
  Given two random points p1 and p2 in the unit circle,
  * compute the distance d between the points;
  * estimate the average value of d;
  * estimate the variance s of d;

  Number of simulations was  1000
  d:  estimate =  0.8904595555290439 exact =  0.9054147873672269
  s:  estimate =  0.1781511586846966 exact =  0.1802240628167594

circle_distance:
  Normal end of execution.