program Project10;
{$APPTYPE CONSOLE}
var A,B,C,X1,Y1,X2,Y2,X3,Y3:REAL;
begin
WRITELN('Vvedit koordynaty tochok X1,Y1,X2,Y2,X3,Y3');
READLN(X1,Y1,X2,Y2,X3,Y3);
A:=SQRT(SQR(X2-X1)+SQR(Y2-Y1));
B:=SQRT(SQR(X3-X2)+SQR(Y3-Y2));
C:=SQRT(SQR(X3-X1)+SQR(Y3-Y1));
IF (A+B>C) AND (B+C>A) AND (C+A>B) THEN
WRITELN('Trykutnyk isnue') else
WRITELN('Trykutnyk ne isnue');
READLN;
end.