#include <stdio.h>
#include <math.h>

int main(void) {
    double east_m = 3.0;
    double north_m = 4.0;
    double area_m2 = 81.0;
    if (!isfinite(area_m2) || area_m2 < 0.0) { return 1; }
    printf("Distance: %.1f m\n", hypot(east_m, north_m));
    printf("Square side: %.1f m\n", sqrt(area_m2));
    return 0;
}