Write a program to input 3 sides of a triangle and calculate its area.

#include<iostream.h>

#include<conio.h>

#include<math.h>

void main()

{

double s1, s2, s3, ar, s;

cout<< "Enter 3 sides :";

cin >> s1 >> s2 >> s3;

s = (s1+s2+s3)/2;

ar = sqrt( s * ( s - s1) * (s  - s2) * (s - s3));

cout << "\n The Area of the triangle = " << ar;

getch();

}