## C Program to Calculate Area and Circumference of circle

## C Program to find area and circumference of circle

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 | #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 :

1 2 3 | 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.

1 | Area of Circle = PI * R * R |

and

1 | 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.

1 2 | printf("\nEnter radius of circle: "); scanf("%d", &rad); |

## Download C Program :

[box style=”download”]Download Area Of Circle Program | Right Click and Save As[/box]