program tchk3;
var X1, X2, X3: real;
begin
write('Введите координаты трех точек A, B, C : ');
read(X1, X2, X3);
writeln('AC = ', abs(X3-X1));
writeln('BC = ', abs(X3-X2));
writeln('AC * BC = ', abs(X3-X1)* abs(X3-X2));
end.
program tchk3;
var X1, X2, X3: real;
begin
write('Введите координаты трех точек A, B, C : ');
read(X1, X2, X3);
writeln('AC = ', abs(X3-X1));
writeln('BC = ', abs(X3-X2));
writeln('AC * BC = ', abs(X3-X1)* abs(X3-X2));
end.