The area is a quantity that represents the extent of the figure in two dimensions. The area of a circle is the area covered by the circle in a two dimensional plane.
To find the area of a circle, the radius[r] or diameter[d](2* radius) is required.
The formula used to calculate the area is (π*r2) or {(π*d2)/4}.
Example Code
To find the area of a circle using radius.
#include <stdio.h>
int main(void) {
float pie = 3.14;
int radius = 6;
printf("The radius of the circle is %d \n" , radius);
float area = (float)(pie* radius * radius);
printf("The area of the given circle is %f", area);
return 0;
}Output
The radius of the circle is 6 The area of the given circle is 113.040001
Example Code
To find the area of a circle using radius using math.h library. It uses the pow function of the math class to find the square of the given number.
#include <stdio.h>
int main(void) {
float pie = 3.14;
int radius = 6;
printf("The radius of the circle is %d \n" , radius);
float area = (float)(pie* (pow(radius,2)));
printf("The area of the given circle is %f", area);
return 0;
}Output
The radius of the circle is 6 The area of the given circle is 113.040001
Example Code
To find the area of a circle using Diameter.
#include <stdio.h>
int main(void) {
float pie = 3.14;
int Diameter = 12;
printf("The Diameter of the circle is %d \n" , Diameter);
float area = (float)((pie* Diameter * Diameter)/4);
printf("The area of the given circle is %f", area);
return 0;
}Output
The Diameter of the circle is 12 The area of the given circle is 113.040001