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Area of triangle by Heron's formula

Beginning status (before activation):

   1 *
   2 *Let the sides of a triangle be a=13, b=14, and c=15.
   3 *The area of the triangle can be calculated by Heron's formula
   4 *Area=sqrt(p*(p-a)*(p-b)*(p-c))
   5 *where p equals the half of the perimeter p=(a+b+c)/2 and
   6 *where sqrt() denotes the square root.
   7 *Hence Area=  
   8 *

Ending status (after activation):

   1 *
   2 *Let the sides of a triangle be a=13, b=14, and c=15.
   3 *The area of the triangle can be calculated by Heron's formula
   4 *Area=sqrt(p*(p-a)*(p-b)*(p-c))
   5 *where p equals the half of the perimeter p=(a+b+c)/2 and
   6 *where sqrt() denotes the square root.
   7 *Hence Area=84
   8 *

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