Suppose a, b, and c denote the lengths of the sides of a triangle. Then the area of the triangle can be calculated using the formula:

where

Write a program that asks the user to input the length of sides of the triangle and print the area.

```
#include <stdio.h>
#include <math.h>
int main()
{
float a, b, c, s, area;
printf("Enter the length of side 1 :");
scanf("%f", &a);
printf("Enter the length of side 2 :");
scanf("%f", &b);
printf("Enter the length of side 3 :");
scanf("%f", &c);
s = (a + b + c) / 2;
area = sqrt(s*(s - a)*(s - b)*(s - c));
printf("\nThe area of the triangle is %0.2f", area);
return 0;
}
```

Enter the length of side 2 :11

Enter the length of side 3 :13

The area of the triangle is 53.44