Question 984638
Hi,
Use hero's formula as follows
{{{A=sqrt((s*(s-a)*(s-b)*(s-c)))}}}
Where {{{s=(a+b+c)/2}}}
Now,s=(5+6+13)/2
       =24/2
       =12
Substitute the above in the formula
{{{A=sqrt((12)*(12-5)*(12-6)*(12-13))}}}
Evaluating the above,
A=6.5i
Note the answer is a complex number.