import java.util.*;
import java.lang.*;
import java.io.*;
class Ideone
{
public static void main
(String[] args
) {
double xA, yA, xB, yB, xC, yC, S; // описание переменных
Scanner sc
= new Scanner
(System.
in); System.
out.
println("Coordinates of point A:\n"); //ввод координат вершин треугольника xA = sc.nextDouble();
yA = sc.nextDouble();
System.
out.
println("Coordinates of point B:\n"); xB = sc.nextDouble();
yB = sc.nextDouble();
System.
out.
println("Coordinates of point C:\n"); xC = sc.nextDouble();
yC = sc.nextDouble();
S
=Math.
abs((xB
-xA
)*(yC
-yA
)-(xC
-xA
)*(yB
-yA
))/2.0; //вычисление площади System.
out.
printf("Square=%f",S
); }
}
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