#include <stdio.h>
#include <math.h>
int main() {
double radius, diameter, circumference, area;
// Input the radius from the user
printf("Enter the radius of the circle: ");
scanf("%lf", &radius);
// Calculate the diameter, circumference, and area
diameter = 2 * radius;
circumference = 2 * M_PI * radius;
area = M_PI * pow(radius, 2);
// Display the results
printf("Diameter of the circle: %.2lf\n", diameter);
printf("Circumference of the circle: %.2lf\n", circumference);
printf("Area of the circle: %.2lf\n", area);
return 0;
}