#include<bits/stdc++.h>
using namespace std;
float a,b,c,p;
int main()
{
    cin>>a>>b>>c;
    if (a+b>c&&b+c>a&&a+c>b)
    {
        cout<<"la tam giac"<<endl;
        if(a*a+b*b==c*c||a*a+c*c==b*b||c*c+b*b==a*a) cout<<"tam giac vuong"<<endl;
        else if (a==b&&b==c) cout<<"tam giac deu"<<endl;
        else if (a==b||b==c||c==a) cout<<"tam giac can"<<endl;
        else if(a*a>b*b+c*c||b*b>a*a+c*c||c*c >a*a+b*b) cout<<"tam giac tu"<<endl;
        else cout<<"tam giac nhon"<<endl;
        p=(a+b+c)/2;
        cout<<"chu vi: "<<p*2<<endl;
        cout<<"dien tich: "<<sqrt(p*(p-a)*(p-b)*(p-c));
    }
    else cout<<"khong la tam giac";
}

uses crt;
var a,b,c:longint; p:real;
begin
clrscr;
   write('Nhap 3 canh cua tam giac: ');readln(a,b,c);
   if (a+b>c)and(a+c>b)and(b+c>a) then
      begin
         writeln('Day la ba canh cua tam giac');
         if (a=b)or(b=c)or(a=c) then writeln('Day la tam giac can');
         if (a=b)and(b=c) then writeln('Day la tam giac deu');
         if (sqr(a)+sqr(b)=sqr(c))or(sqr(a)+sqr(c)=sqr(b))or(sqr(b)+sqr(c)=sqr(a))
              then writeln('Day la tam giac vuong');
         p:=(a+b+c)/2;
         writeln('Chu vi: ',a+b+c);
         writeln('Dien tich: ',sqrt(p*(p-a)*(p-b)*(p-c)));
      end else writeln('Day khong la ba canh cua tam giac');
readln
end.