static double minRevolutions ( double r , int x1 , int y1 , int x2 , int y2 ) {
  double d = Math . sqrt ( ( x1 - x2 ) * ( x1 - x2 ) + ( y1 - y2 ) * ( y1 - y2 ) ) ;
  return Math . ceil ( d / ( 2 * r ) ) ;
}

static double minRevolutions ( double r , int x1 , int y1 , int x2 , int y2 ) { double d = Math . sqrt ( ( x1 - x2 ) * ( x1 - x2 ) + ( y1 - y2 ) * ( y1 - y2 ) ) ; return Math . ceil ( d / ( 2 * r ) ) ; }
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