C Program to Calculate Area Of a Circle

September 30, 2022

Area of Circle in C

Here, in this page we will discuss the program to find area of circle in C programming language.

The area of a circle can be found by using the formula:
Area of circle= 𝝅*R* R , or
Area of circle = (𝝅*D* D)/4

User gives an input
The input is stored in a float type variable say radius.
Another float type variable is taken say area and variable pi initialized with 3.14.
Now using the formula we find the area of the circle of radius radius and store it in area.

area= pi* radius* radius;

#include <stdio.h>

int main(){
    float r =3, pi=3.14, area;
    
    area=pi*r*r;
    printf("Area of circle is %.2f", area);
}

Area of circle is 28.26

User gives an input
The input is stored in a float type variable say d.
Another float type variable is taken say area and variable pi initialized with 3.14.
Now using the formula we find the area of the circle of diameter d and store it in area.

area= (pi* d* d)/4;

#include <stdio.h>
int main(){
    float d = 6, pi=3.14, area;
    
    area=(pi*d*d)/4;
    printf("Area of circle is %.2f", area);
}

Area of circle is 28.26

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