nè e
Program Chu_nhat;
uses crt;
Var a, b, S, CV: real;
Begin
Write('Nhap chieu dai:'); readln(a);
Write('Nhap chieu rong:'); readln(b);
S := a*b;
CV := (a+b)*2;
Writeln('Dien tich hinh chu nhat la:',S);
Writeln('Chu vi hinh chu nhat la:',CV:10:2);
readln
end.