`1.`

program bai1;

uses crt;

var a,b:integer;

begin

clrscr;

read(a,b);

writeln('chi vu hinh chu nhat la: ',(a+b)*2);

writeln('dien tich hinh hinh chu nhat la: ',a*b);

readln;

end.

`2.`

program bai2;

uses crt;

var a,b,c,h:integer;

begin

clrscr;

read(a,b,c,h);

writeln('chu vi tam giac la: ',a+b+c);

writeln('dien tich tam giac la: ',(a*h)/2:0:2);

readln;

end.

Bài 1:

#include <bits/stdc++.h>
#define ll long long
using namespace std;
ll n, m;
int main()
{
    ios::sync_with_stdio(0);
    cin.tie(0);
    cout.tie(0);
    cin >> n >> m;
    cout << (n + m) * 2 << endl;
    cout << n * m;
    return 0;
}

Bài 2:

#include <bits/stdc++.h>
#define ll long long
using namespace std;
ll a, b, c, h;
int main()
{
    ios::sync_with_stdio(0);
    cin.tie(0);
    cout.tie(0);
    cin >> a >> b >> c >> h;
    cout << a + b + c << endl;
    cout << (a * h) / 2;
    return 0;
}