import java.text.*; import java.util.*; public class Main { public static void main(String[] args){ Scanner sc=new Scanner(System.in); while(1==1){ DecimalFormat df=new DecimalFormat("#0.00"); double a=sc.nextInt(); double b=sc.nextInt(); double c=sc.nextInt(); double d=Math.sqrt(1-Math.pow((a*a+b*b-c*c)/(2*a*b),2)); System.out.println(df.format(0.5*d*b*a)); } } } |
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