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# at=√s(s-a)(s-b)(s-c)

where a, b , c are the side of triangle

S =(a+b+c)/2 it is semi Perimeter

There logic is that first of all we are going to take input from the user in order to calculate the value of area of triangle

so see the algorithm for above problem statement

Algorithm of give Problem

Input: Three side of triangle
Output: Area of triangle using given formula

Step1: Take the side of triangle as input from user let a, b, s.
Step2: Now Calculate the value of S using below formula

S =(a+b+c)/2

Step3: Now calculate the value of area of triangle using below formula

Area = sqrt(S * (S-a) * (S-b) * (S-c));

Note: in order to calculate Square Root we make use of Function Sqrt
from header file math.h

Step4: Print the value of Area
Step5: Exit.

## Flow Chart

Program in C language

#include<stdio.h>
#include<conio.h>
#include<math.h>

void main()
{
double a,b,c,at,temp,S;

printf("Enter the size of side of triangle\n");
scanf("%lf %lf %lf",&a,&b,&c);
S=(a+b+c)/2;
temp=S*(S-a)*(S-b)*(S-c);
at=sqrt(temp);
printf("Area of triangle is %3.2lf",at);

getch();
}