Сравни картинки. Как они нарисованы? Проанализируй​

var a: integer;

begin

writeln ('vvedite nomer mesuaca');

read (a);

if (a=1) then writeln ('30');

if (a=2) then writeln ('28');

if (a=3) then writeln ('30');  

  if (a=4) then writeln ('31');  

  if (a=5) then writeln ('30');  

  if (a=6) then writeln ('31');  

  if (a=7) then writeln ('30');  

  if (a=8) then writeln ('31');  

  if (a=9) then writeln ('30');  

  if (a=10) then writeln ('31');  

  if (a=11) then writeln ('30');  

  if (a=12) then writeln ('31');  

end. 

program m; uses crt; var k,s: real; i: integer; beginclrscr; for i: =1 to 10 dobegink: =i/(i+1); s: =s+k; end; writeln(s: 2: 2); readkey; end.

a = sqrt((x1-x2)*(x1-x2)+(y1-y2)*(y1-y2));

b = sqrt((x3-x2)*(x3-x2)+(y3-y2)*(y3-y2));

c = sqrt((x1-x3)*(x1-x3)+(y1-y3)*(y1-y3));

writeln("периметр = ",a+b+c);

s = {формула герона}