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- var
- x,y : array [1..100] of real;
- x1,x2,x3,x4,y1,y2,y3,y4,sum,d1,d2,d3 : real;
- begin
- readln(x1, y1);
- readln(x2, y2);
- d1:=sqrt(sqr(x1-x2)+sqr(y1-y2));
- d2:=sqrt(sqr(x2-x3)+sqr(y2-y3));
- d3:=sqrt(sqr(x1-x3)+sqr(y1-y3));
- writeln(d1*d3:0:0);
- end.
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