#include <stdio.h>
int main(void) {
// your code goes here
return 0;
}
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#include<stdio.h>
#define PI 3.1415926
int main()
{
float r,c, area;
printf(" enter radium r:"";
scanf ("%f", &r);
C=PI*2*r;
area=PI*p*r;
printf("C=%. 2f\nS=%.2f",c,area);
}