Calculate the Area of the Circle with C language

#include <stdio.h>
#define PI 3.141
int main()
{
    double radius, area;
    printf("Enter Radius: ");
    scanf("%lf", &radius);
    area = PI * radius * radius;
    printf("%.2lf\n", area);
    return 0;
}

Output:-

Enter Radius: 5
78.53