program hinhvuong;
var a,cv,dt:real;
begin
realn(a);
cv:=a*4;
dt:=a*a;
writeln(chu vi la:', cv:2:2);
writeln(dien tich la:', dt:2:2);
readln;
end.
program Hinh_Chu_Nhat;
uses crt;
var a,b,dt: integer;
begin
readln(a);
readln(b);
dt:=(a*b);
writeln(‘Dien tich la:’,dt);
readln
end.
program hinhtamgiac;
var a,b,c,cv,dt:real;
readln(a);
readln(b);
readln(c);
if (a+b<=c) or (a+c<=b) or c+b<=a) then
writeln('ko la 3 canh cua 1 tam giac') else
begin
writeln('la 3 canh cua 1 tam giac);
p:=(a+b+c)/2;
cv:=p*2;
dt:=sqrt(p*(p-a)*(pc-));
writeln('chu vi la:', cv:2:2);
writeln(dien tich la:', dt:2:2);
readln;
end.
Program chuvihinhtron_dientichhinhtron;
Uses crt;
Var R: integer ;
S,C : real;
Const Pi=3,14;
Begin
clrser;
Writeln(‘R= ‘); Readln(R);
C:=Pi*2*R;
S:=Pi*R*R;
Writeln(‘Chu vi la C= ‘,C);
Writeln(‘Dien tich la S= ‘,S);
Readln
End.