//Calcular area do circulo
#include <iostream>
int main (){
	const float pi = 3.14159265F;
	int radius;
	float area;
	std::cout << "Qual o raio do circulo?";
	std::cin >> radius;
	area = pi * (radius * radius );
	std::cout << "A area e'" << area << std::endl;
}