x1=input('x1=');

y1=input('y1=');

x2=input('x2=');

y2=input('y2=');

x3=input('x3=');

y3=input('y3=');

v1=[x1 y1];

v2=[x2 y2];

v3=[x3 y3];

a=sqrt((x1-x2)^2+(y1-y2)^2);

b=sqrt((x2-x3)^2+(y2-y3)^2);

c=sqrt((x3-x1)^2+(y3-y1)^2);

if a > 0 & b > 0 & c > 0 & (a + b > c) & (a + c > b) & (b + c > a)

   s=(a+b+c)/2;
   Area=sqrt(a*(s-a)*(s-b)*(s-c))
   Perimeter=a+b+c
plot([x1 x2 x3 x1],[y1 y2 y3 y1])

   title('Triangle')
   xlabel('x axis')
   ylabel('y axis')
   text(x1,y1,sprintf('(%d,%d)',x1,y1))
   text(x2,y2,sprintf('(%d,%d)',x2,y2))
   text(x3,y3,sprintf('(%d,%d)',x3,y3))
else

    disp('Not a triangle, please reinsert')
end