câu 1:
program ct;
uses crt;
begin
clrscr;
writeln('cong cha nhu nui thai son');
writeln('nghi me nhu nuoc o ngoai bien dong');
writeln('mot long thoi me kinh cha')'
writeln('cho tron chu hieu moi la dao con');
readln
end.
câu 2:
program ct;
uses crt;
const pi=3.14;
var cv,dt,r:real;
begin
clrscr;
write('nhap ban kinh='); readln(r);
cv:=2*r*pi;
dt:=sqr(r)*pi;
writeln('chu vi hinh tron la=',cv:4:2);
writeln('dien tich hinh tron la=',dt:4:2);
readln
end.