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#include<stdio.h>
#define PI 3.14159
#include<conio.h>
void main()
{
float r, a;
printf("Dairenin yaricapini giriniz:");
scanf_s("%f", &r);
a = PI*r*r;
printf("\n");
printf("Dairenin alani:%8.3f\n", a);
getche();
}