# Program for finding the area of triangle when three sides are given

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```#include<stdio.h>
#include<conio.h>
void main()
{
float a,b,c,s,area;
clrscr();
printf("Enter three sides a b c\n");
scanf("%f%f%f",&a,&b,&c);
if((a<=0)||(b<=0)||(c<=0))   /* a side of a triangle can not be
0 or -ve number */
printf("\n given sides can not form a triangle \n");
else
if(((a+b)<=c)||((a+c)<=b)||((b+c)<=a))  /* to form a triangle sum of any two
sides must greater than third side */
printf("\n given sides can not form a triangle \n");
else    /* there is possibility of triangle formation */
{
s=(a+b+c)/2;
area=squt(s*(s-a)*(s-b)*(s-c));
printf("\n area = %.4f \n", area);
}
getch();
}
Output 1:
Enter three sides a b c
2 3 4
area = 2.9047
Output 2:
Enter three sides a b c
given sides can not form a triangle```

Note: This program takes time as input in terms of seconds, minutes and hours and checks for its validity and increases the input time by one second.

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