View Code of Problem 24

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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