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uses crt;
var xa,ya,xb,yb,xc,yc:integer;
ab,ac,bc,cv,p,s:real;
begin
clrscr;
write('Nhap toa do diem A:'); readln(xa,ya);
write('Nhap toa do diem B:'); readln(xb,yb);
write('Nhap toa do diem C:'); readln(xc,yc);
ab:=sqrt(sqr(xa-xb)+sqr(ya-yb));
ac:=sqrt(sqr(xa-xc)+sqr(ya-yc));
bc:=sqrt(sqr(xb-xc)+sqr(yb-yc));
if (ab+bc>ac) and (ab+ac>bc) and (ac+bc>ab) then
begin
cv:=ab+bc+ac;
p:=cv/2;
s:=sqrt(p*(p-ab)*(p-ac)*(p-bc));
writeln('Chu vi la: ',cv:4:2);
writeln('Dien tich la: ',dt:4:2);
kt:=0;
if (ab=ac) and (ab<>bc) and (ac<>bc) then kt:=1;
if (ac=bc) and (ac<>ab) and (bc<>ab) then kt:=1;
if (ab=bc) and (ab<>ac) and (bc<>ac) then kt:=1;
if (ab=ac) and (ac=bc) then kt:=2;
if sqr(ab)=sqr(ac)+sqr(bc) then kt:=3;
if sqr(ac)=sqr(ab)+sqr(bc) then kt:=3;
if sqr(bc)=sqr(ab)+sqr(ac) then kt:=3;
if kt=0 then writeln('Day la tam giac thuong');
if kt=1 then writeln('Day la tam giac can');
if kt=2 then writeln('Day la tam giac deu');
if kt=3 then writeln('Day la tam giac vuong');
end
else writeln('Day khong phai la toa do 3 dinh cua mot tam giac');
readln;
end.
#include <bits/stdc++.h>
using namespace std;
long long n,a[1000],m,i;
bool kt;
{
cin>>n;
for (i=1; i<=n; i++) cin>>a[i];
cin>>m;
kt=false;
for (i=1; i<=n; i++)
if (a[i]==m) kt=true;
if (kt==true) cout<<"Co";
else cout<<"Khong";
return 0;
}
uses crt;
var a,b,c:real;
begin
clrscr;
readln(a,b,c);
if (a>0) and (b>0) and (c>0) and (a+b>c) and (a+c>b) and (b+c>a) then
begin
if (a=b) and (b=c) then write('Day la tam giac deu')
else writeln('Day khong la tam giac deu');
end
else writeln('Day khong la ba canh trong mot tam giac');
readln;
end.
#include <bits/stdc++.h>
using namespace std;
long long a,b,c;
int main()
{
cin>>a>>b>>c;
if (a+b>c && b+c>a && a+c>b) cout<<"YES";
else cout<<"NO";
return 0;
}
