Calcul de la surface et du volume d'un prisme hexagonal en programmation C

Surface Area = 3ah + 3√3*(a2)
Volume = (3√3/2)a2h

#include <stdio.h>
#include<math.h>
int main() {
   float a = 5, h = 10;
   //Logic to find the area of hexagonal prism
   float Area;
   Area = 6 * a * h + 3 * sqrt(3) * a * a;
   printf("Surface Area: %f</p><p>",Area);
   //Logic to find the Volume of hexagonal prism
   float Volume;
   Volume = 3 * sqrt(3) * a * a * h / 2;
   printf("Volume: %f</p><p>",Volume);
   return 0;
}

Surface Area: 429.903809
Volume: 649.519043