C :

#include <stdio.h>

#define PI 3.1415926535

int main(void) {
	double h, r;
	scanf("%lf%lf", &h, &r);
	printf("%.2f\n", 2*PI*r*h+2*PI*r*r);
	return 0; 
}

C++ :

#include<cstdio>
using namespace std;
int main()
{
    double h,r,pi,s;    
    scanf("%lf%lf",&h,&r);  
	pi=3.1415926535; 
    s= 2.0 *pi*r*r +  2.0*pi*r *h   ;
    printf("%.2lf\n",s);     
    return 0; 
}

Pascal :

Program ygjsb;
const pi=3.1415926535;
  Var
   h,r,s:real;
  begin
   read(h,r);
   s:=2*pi*r*r+2*pi*r*h;
   writeln(s:0:2);
  end.