Area & Volume

calculate the area of circle

//PI*r*r

#include <stdio.h>

#include<math.h>

#define PI 3.142

int main()

{

    int r;

    float A;

    printf("Enter the radius of circle\n");

    scanf("%d",&r);

    A = PI *r*r;

    printf("\nThe Area of circle is A = %.2f",A);

    return 0;

}

perimeter of circle

#include <stdio.h>

#include<math.h>

#define PI 3.142

int main()

{

    int r;

    float P;

    printf("Enter the radius of circle\n");

    scanf("%d",&r);

    P = 2*PI *r;

    printf("\nThe Perimeter of circle is P = %.2f",P);

    return 0;

}

Find area of rectangle

#include<stdio.h>

int main()

{

    int A,w,l;

    printf("\nEnter width &length of rectangle");

    scanf("%d%d",&w,&l);

    A = w*l;

    printf("Area of rectangle is A = %d",A);

    return 0;

}

Find perimeter of rectangle

#include<stdio.h>

int main()

{

    int P,w,l;

    printf("\nEnter width &length of rectangle");

    scanf("%d%d",&w,&l);

    P = 2*(w+l);

    printf("Area of rectangle is P = %d",P);

   return 0;

}

 C program to find the area of a triangle, given three sides

#include <stdio.h>
#include <math.h>
int  main()
{
int s, a, b, c, area;
printf("Enter the values of a, b and c \n");
scanf("%d %d %d", &a, &b, &c);
s = (a + b + c) / 2;
area = sqrt(s * (s - a) * (s - b) * (s - c));
printf("Area of a triangle = %d \n", area);

return 0;
}