View Compilation Error

0_0_6144080_16888\Main.java:23: pow(double,double) in java.lang.Math cannot be applied to (double)
        		total = Math.sqrt( Math.pow(x1 - x2) + Math.pow(y2 - y1) );
        		                       ^
0_0_6144080_16888\Main.java:23: pow(double,double) in java.lang.Math cannot be applied to (double)
        		total = Math.sqrt( Math.pow(x1 - x2) + Math.pow(y2 - y1) );
        		                                           ^
0_0_6144080_16888\Main.java:23: sqrt(double) in java.lang.Math cannot be applied to (java.lang.String)
        		total = Math.sqrt( Math.pow(x1 - x2) + Math.pow(y2 - y1) );
        		            ^
3 errors