# C Program to Calculate the Perimeter and Area of Rong

## C Program to Calculate Area and Perimeter of Ring

```Area of Ring
Formula to find area of ring:
A=π(R2﹣r2)

Perimeter of Ring
Formula to find perimeter of ring:
Perimeter = 2π(R+r)
```

This C code accepts the inner and outer radius and finds the area and perimeter of ring.
``````/* Aim: To calculate the perimeter and area of ring */

#include<stdio.h>
int main()
{
float area,a,b,p;

printf("\n Enter inner radius of ring: ");
scanf("%f",&a);

printf("\n Enter outer radius of ring: ");
scanf("%f",&b);

p=2*3.142*(a+b);
area=3.142*(b*b-a*a);

printf("\n The Perimeter of ring is  : %f",p);
printf("\n \n The area of ring is  : %f \n \n",area);
return 0;
}``````

### Output:

``` Enter inner radius of ring: 12

Enter outer radius of ring: 16

The Perimeter of ring is  : 175.951996

The area of ring is  : 351.903992
```

### Explanation:

Accept the values of inner and outer radius of ring from user and calculate the area and perimeter according to the formula given above.