programme C(radius of circle)

 radius,diameter,circumference,area

#include<stdio.h>

int main()

{

    float radius,diameter,circumference,area;

    printf("enter the radius of the circle: ");

    scanf("%f",&radius);

    diameter=2*radius;

    circumference=2*3.14159*radius;

    area=3.14159*radius*radius;

    printf("The diameter of the circle is %.3f\n",diameter);

    printf("The circumference ofthe circle isd %.3f\n",circumference);

    printf("The area of the circle is %.3f ",area);

    return 0;

}