- Write a C program to find circumference and area of a circle.
- WAP in C to find circumference and area of circle when radius is given.

#### Required Knowledge

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.

**Circumference of Circle = 2 x PI x Radius****Area of Circle = PI X Radius X Radius**

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

/* * C program to find circumference(perimeter) and area of a circle */ #include <stdio.h> #define PI 3.141 int main() { float radius; float circumference, area; /* * Take Radius of circle as input from user */ printf("Enter Radius of Circle\n"); scanf("%f", &radius); /* * circumference = 2 x PI x Radius */ circumference = 2*PI*radius; /* * Area of Circle = PI X Radius X Radius */ area = PI*(radius*radius); 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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