29.1

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

double S(double a)
{
    return a*a*sqrt(3.0)/4.0;
}

double V(double a , double h)
{
    return 1.0*S(a)*h/3.0;
}
int main()
{
    double a = 0.0, h = 0.0;
    printf("INPUT a\n");
    scanf_s("%lf",&a);
    printf("INPUT h\n");
    scanf_s("%lf",&h);
    printf("S = %g\n",S(a));
    printf("V = %g\n",V(a,h));
}