Main.java

import java.io.IOException;
import java.util.Scanner;

public class Main {
 
    public static void main(String[] args) throws IOException {
        Scanner sc = new Scanner(System.in);

        double A, B, C, triangulo, circulo, trapezio, quadrado, retangulo;
        final double PI = 3.14159;

        A = sc.nextDouble();
        B = sc.nextDouble();
        C = sc.nextDouble();

        triangulo = A * C / 2;
        circulo = PI * Math.pow(C, 2);
        trapezio = (A + B) * C / 2;
        quadrado = Math.pow(B, 2);
        retangulo = A * B;
        
        System.out.printf("TRIANGULO: %.3f%n", triangulo);
        System.out.printf("CIRCULO: %.3f%n", circulo);
        System.out.printf("TRAPEZIO: %.3f%n", trapezio);
        System.out.printf("QUADRADO: %.3f%n", quadrado);
        System.out.printf("RETANGULO: %.3f%n", retangulo);

        sc.close();
    }
 
}