#include<stdio.h>
#include<locale.h>
#define PI 3.141592
int main(void)
{
double raio, area;
printf("Por obséquio, digite o raio do círculo: \n");
area = PI * (raio*raio);
printf("A área do círculo é %.4lf\n",area
);
return 0;
}
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