static void circle_equation ( double x1 , double y1 , double r ) {
  double a = - 2 * x1 ;
  double b = - 2 * y1 ;
  double c = ( r * r ) - ( x1 * x1 ) - ( y1 * y1 ) ;
  System . out . print ( "x^2 + (" + a + " x) + " ) ;
  System . out . print ( "y^2 + (" + b + " y) = " ) ;
  System . out . println ( c + "." ) ;
}

static void circle_equation ( double x1 , double y1 , double r ) { double a = - 2 * x1 ; double b = - 2 * y1 ; double c = ( r * r ) - ( x1 * x1 ) - ( y1 * y1 ) ; System . out . print ( " x ^ 2 ▁ + ▁ ( " + a + " ▁ x ) ▁ + ▁ " ) ; System . out . print ( " y ^ 2 ▁ + ▁ ( " + b + " ▁ y ) ▁ = ▁ " ) ; System . out . println ( c + " . " ) ; }
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