program hotrotinhoc;
var i : integer;
S,r: real ;
function kt(i: integer) : boolean ;
var r : real;
begin
kt:=false;
write('Ban kinh r='); readln(r);
if s=3.14*n*n then kt:=true;
end;
begin
if kt=true then write(s);
readln
end.
Đúng 0
Bình luận (1)