Submission #111229

---

Source Code Expand

import java.util.ArrayList;
import java.util.Scanner;

public class Main {

	Scanner sc = new Scanner(System.in);
	public void run() {
		int xa = sc.nextInt();
		int ya = sc.nextInt();
		int xb = sc.nextInt();
		int yb = sc.nextInt();
		int xc = sc.nextInt();
		int yc = sc.nextInt();
		calc(xa, ya, xb, yb, xc, yc);
			
	}
	public void calc(int xa, int ya, int xb, int yb, int xc, int yc){
		double ta = (xa - xb) * (xa - xb) + (ya - yb)*(ya - yb);
		double a = Math.sqrt(ta);
		double tb = (xa - xc) * (xa - xc) + (ya - yc) * (ya - yc);
		double b = Math.sqrt(tb);
		double tc = (xb - xc) * (xb - xc) + (yb - yc) * (yb - yc);
		double c = Math.sqrt(tc);
		double cosa = (b * b + c * c - a * a)/ (2 * b * c);
		double ts = 1 - cosa * cosa;
		double sina = Math.sqrt(ts);
		double ans = sina * c * b * 0.5;
		ans += 0.000001;
		System.out.println(ans);
	}

	
	public static void main(String[] args) {
		new Main().run();
	}
}

Submission Info

Judge Result