**π *r*r**and the Circumstances of the Circle are

**2*π*r.**Calculate The Circumference of the Circle By Given Formula.

**Circumference of a Circle**= 2 * π * r.

Here PI (π) is a Greek Letter and r is a Radius (1/2 Of Diameter ). PI (π) =

**3.141592653589793**Approx. It Is A Constant Value for more about Circumference Click Here

**Area of a Circle**= π * r * r

**See Also:**C++ Program To Find Area And Circumference Of Circle

## C Program to Find Area And Circumference of Circle

```
#include <stdio.h>
int main()
{
/*write a c program to find area and circumference of circle*/
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 of Circle : %f ", ci);
return (0);
}
```

**See Also:**JAVA Program To Find Area And Circumference Of Circle

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