# C Program to Find Circumference of Circle and Area of a Circle

In this C program, we will find the circumference and area of circle when radius is given. To find the circumference and area of circle, we will first take radius of circle as input from user using scanf function and then calculate area and perimeter of circle using following formulae.

#### Required Knowledge

• Circumference of Circle = 2 x PI x Radius

## C program to find the circumference and area of circle

```#include <stdio.h>
#define PI 3.141

int main() {
float circumference, area;

printf("Circumference of Circle : %.4f\n",
circumference);
printf("Area of Circle = %.4f\n", area);

return 0;
}
```

Output
```Enter Radius of Circle
4.2
Circumference of Circle : 26.3844
Area of Circle = 55.4072
```

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