java - Determine the square root of a number -

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i have following lines of code homework, takes numbers. trying figure function used find square root of number. how 1 this?

 system.out.println("find value of c if:");  scanner kbreader=new scanner(system.in);  system.out.print("a="+" ");  double a=kbreader.nextdouble();  system.out.print("b=" + " ");  double b=kbreader.nextdouble();  system.out.print("c=" + " " );  system.out.print((a*a)+(b*b));

what's wrong math.sqrt(double)?


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