Program ba_canh_cua_tam_giac;

uses crt;

var a,b,c: real;

BEGIN

Write('nhap do dai canh a'); Readln(a);

Write('nhap do dai canh b'); Readln(b);

Write('nhap do dai canh c'); Readln(c);

If (a<(b+c)) and (b<(c+a)) and (c<(b+a)) then write('do la do dai cua mot tam giac')

else write('do khong la do dai cua mot tam giac');

Readln;

END.

Thanks

bạn ơi viết chương trình bằng chữ hay là ở trong pascal z bạn

uses crt;

var a,b,c,p,s:real;

begin

clrscr;

repeat

write('Nhap a='); readln(a);

write('Nhap b=');c readln(b);

write('Nhap c='); readln(c);

until (a>0) and (b>0) and (c>0);

if (a+b>c) and (a+c>b) and (b+c>a) then 

begin

kt:=0;

if sqr(a)=sqr(b)+sqr(c) then kt:=1;

if sqr(b)=sqr(a)+sqr(c) then kt:=1;

if sqr(c)=sqr(a)+sqr(b) then kt:=1;

if kt=0 then writeln('Day khong la tam giac vuong')

else begin

              writeln('Day la ba canh trong mot tam giac vuong');

p:=(a+b+c)/2;

s:=sqrt(p*(p-a)*(p-b)*(p-c));

writeln('Dien tich tam giac vuong la: ',s:4:2);

end;

end

else writeln('Day khong la ba canh trong mot tam giac');

readln;

end.

Var a,b,c: integer;
begin writeln('nhap ba so duong: ');Readln(a,b,c);
if (a+b>c) and (a+c>b) and (b+c>a) then writeln('3 so nay co the la do dai 3 canh cua 1 tam giac')
else writeln('3 so nay khong the la do dai 3 canh cua 1 tam giac');
End.

#include <bits/stdc++.h>

using namespace std;

double a,b,c;

bool kt;

int main()

{

cin>>a>>b>>c;

if (a+b>c && b+c>a && a+c>b)

{

kt=false;

if (a==b && b!=c && a!=c) kt=true;

if (b==c && b!=a && c!=a) kt=true;

if (a==c && a!=b && c!=b) kt=true;

if (kt==true) cout<<"YES";

else cout<<"NO";

}

else cout<<"NO";

return 0;

}

#include <bits/stdc++.h>

using namespace std;

int n;

int main()

{

cin>>n;

if (n%5==0) cout<<"co";

else cout<<"ko co";

}

uses crt;

var a,b,c:real;

begin

clrscr;

repeat

write('Nhap a='); readln(a);

write('Nhap b='); readln(b);

write('Nhap c='); readln(c);

until (a>0) and (b>0) and (c>0);

if (a+b>c) and (a+c>b) and (b+c>a) then writeln('Day la ba canh trong mot tam giac')

else writeln('Day khong la ba canh trong mot tam giac');

readln;

end.

uses crt;

var a,b,c,p,s: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

p:=(a+b+c)/2;

s:=sqrt(p*(p-a)*(p-b)*(p-c));

writeln('Chu vi la: ',2*p:4:2);

writeln('Dien tich la: ',s:4:2);

end

else writeln('A B C khong phai la chieu dai ba canh cua mot tam giac');

readln;

end.

#include <bits/stdc++.h>

using namespace std;

double a,b,c,h,p,s;

int main()

{

cin>>a>>b>>c;

p=(a+b+c)/2;

s=sqrt(p*(p-a)*(p-b)*(p-c));

if (s>50) cout<<"Dien tich tam giac lon hon";

else cout<<"Dien tich tam giac nho hon";

return 0;

}

PROGRAM DIEN TICH TAM GIAC;
{Nhap vao do dai 3 canh tam giac. Tinh dien tich tam giac ay}
VAR a,b,c,p,S:real;kt:boolean;{kt: kiem tra}
BEGIN
Write('Nhap a: ');readln(a);
Write('Nhap b: ');readln(b);
Write('Nhap c: ');readln(c);
Writeln;
kt:=(a>0)and(b>0)and(c>0)and(a+b>c)
and(b+c>a)and(a+c>b);
If kt=true then
begin
p:=(a+b+c)/2;
S:=sqrt(p*(p-a)*(p-b)*(p-c));
writeln('Dien tich S= ',S:6:2);
end
Else writeln(,'Khong thuc hien vi day khong la do dai 3 canh tam giac');
Readln
END.

* Xin chú ý với bạn rằng: Trước khi tính diện tích tam giác, ta phải kiểm tra xem ba độ dài a, b, c có phải là ba cạnh của tam giác hay không, cho nên cần phải có biến kt:boolean;{kt: kiem tra}

kt:=(a>0)and(b>0)and(c>0)and(a+b>c)
and(b+c>a)and(a+c>b)

Chúc bạn học tốt!

uses crt;
var a,b,c: real;
begin
clrscr;
write('Nhap 3 so a, b, c:');readln(a,b,c);
if (a+b>c)and(a+c>b)and(b+c>a) then
write('3 canh vua nhap la tam giac')

write('3 canh vua nhap ko phai la tam giac');
readln;
end.

#include <iostream>
using namespace std;
int main()
{
    int a,b,c,kt;
    cout<<"Nhap a=";
    cin>>a;
    cout<<"Nhap b=";
    cin>>b;
    cout<<"Nhap c=";
    cin>>c;
    if ((a>0) and (b>0) and (c>0) and (a+b>c) and (a+c>b) and (b+c>a))
    {
        kt=0;
        if (a*a==b*b+c*c) kt=1;
        if (b*b==a*a+c*c) kt=1;
        if (c*c==a*a+b*b) kt=1;
        if ((a==b) and ((a<c) or (a>c)) and ((b<c) or (b>c))) kt=2;
        if ((b==c) and ((b<a) or (b>a)) and ((c<a) or (c>a))) kt=2;
        if ((c==a) and ((c<b) or (c>b)) and ((a<b) or (a>b))) kt=2;
        if ((a==c) and (b==c)) kt=3;
        if (kt==0) cout<<"Day la tam giac thuong";
        if (kt==1) cout<<"Day la tam giac vuong";
        if (kt==2) cout<<"Day la tam giac can";
        if (kt==3) cout<<"Day la tam giac deu";
        if ((kt==1) and (kt==2) ) cout<<"Day la tam giac vuong can";
    }
    else cout<<"Day khong la ba canh trong mot tam giac";
    return 0;
}