#include <iostream>
using namespace std;
#include <iostream>
#include <iomanip>
#include <math.h>
 
int main(int argc, char** argv) {
	double pi = 3.14159;
	double a, b, c;
	double area_triangulo, area_circulo, area_trapezio,
	       area_quadrado,area_retangulo;
 
	std::cin >> a >> b >> c;
 
	area_triangulo = a * c / 2;
	area_circulo = pi * pow(c, 2);
	area_trapezio = ((a + b)* c)/2;
	area_quadrado = pow(b, 2);
	area_retangulo = a * b;
 
	std::cout << std::fixed << std::setprecision(3);
	std::cout << "TRIANGULO: " <<area_triangulo << std::endl;
	std::cout << "CIRCULO: " <<area_circulo << std::endl;
	std::cout << "TRAPEZIO: " <<area_trapezio << std::endl;
	std::cout << "QUADRADO: " <<area_quadrado << std::endl;
	std::cout << "RETANGULO: " <<area_retangulo << std::endl;
 
	return 0;
}
 

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

My4wCjQuMAo1LjI=

3.0
4.0
5.2