C :

#include<stdio.h>
int main()
{
	int a,b;
	scanf("%d%d",&a,&b);
	printf("%.2f", 3.1415926*2*a*(a+b));
	return 0;
}

C++ :

#include<bits/stdc++.h>
using namespace std;
int main(){
	int r,h;
	double pi = 3.1415926;
	cin>>r>>h;
	cout<<fixed<<setprecision(2);
	cout<<2*r*pi*h + r*r*pi*2; 
	return 0;
}

Java :

import java.util.Scanner;

public class Main {
	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		double r = sc.nextDouble();
		double h = sc.nextDouble();
		double c = 2 * 3.1415926 * r;
		double s = 3.1415926 * r * r;
		double t = c * h + s * 2;
		System.out.println(String.format("%.2f", t));
	}
}

Python :

r,h = map(float,input().split())
pi = 3.1415926
S = pi*r*r*2 + 2*pi*r*h
print('%.2f'% S)