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#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; }