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# How to find area and circumference of circle using C Programming

#### C Program to find area and circumference of circle

```
#include <stdio.h>
int main() {
int rad;
float PI = 3.14, area, ci;
printf("\nEnter radius of circle: ");
scanf("%d", &rad);
area = PI * rad * rad;
printf("\nArea of circle : %f ", area);
ci = 2 * PI * rad;
printf("\nCircumference : %f ", ci);
return (0);
}
```

#### Output :

```
Enter radius of a circle : 1
Area of circle : 3.14
Circumference : 6.28
```

#### Explanation of Program :

In this program we have to calculate the area and circumference of the circle. We have following 2 formulas for finding circumference and area of circle.

```
Area of Circle = PI * R * R
```

And

```
Circumference of Circle = 2 * PI * R
```

In the above program we have declared the floating point variable PI whose value is defaulted to 3.14.We are accepting the radius from user.

```
printf("\nEnter radius of circle: ");
scanf("%d", &rad);
```

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