WAP to calculate the area of a triangle

Write a program to calculate the area of a triangle with sides a, b, and c.

/* Write a program to compute the area of a triangle with sides a,b,c */

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

int main() {
  float a,b,c,s,A;
  printf("Enter value of a, b and c.\n");
  scanf("%f%f%f",&a,&b,&c);
  s = (a+b+c)/2;
  A = sqrt(s*(s-a)*(s-b)*(s-c));
  printf("Area of triangle is %f",A);
  getch();
  return 0;
}

Output

For an input a=6, b=10, and c=8. Are will be 24.000000

Also, see how you can calculate the area and circumference of a circle.