Calculo da Area

Aplicacao.java

public class Aplicacao {
	
	public static void main(String[] args) {
	
	double area;	
		
	Triangulo tri = new Triangulo();
	tri.b = 5;
	tri.h = 3;
	area = tri.calcularArea();
	System.out.println("Area do triangulo: " + area);
	
	Quadrado q = new Quadrado();
	q.l = 4;
	area = q.calcularArea();
	System.out.println("Area do quadrado: " + area);
	
	Circunferencia c = new Circunferencia();
	c.r = 3;
	area = c.calcularArea();
	System.out.println("Area da circunferencia: " + area);
	
	Trapezio tra = new Trapezio();
	tra.B = 7;
	tra.b = 4;
	tra.h = 5;
	area = tra.calcularArea();
	System.out.println("Area do trapezio: " + area);
		
	}
}

Circunferencia.java

public class Circunferencia {
	
	double r;
	
	double calcularArea() {
		double area = (r*r)*Math.PI;
		return area;
	}

}

Quadrado.java

public class Quadrado {
	
	double l;
	
	double calcularArea() {
		double area = l*l;
		return area;
	}

}

Trapezio.java

public class Trapezio {
	
	double B;
	double b;
	double h;
	
	double calcularArea() {
		double area = ((B+b)*h)/2;
		return area;
	}

}

Triangulo.java

public class Triangulo {
	
	double b;
	double h;
	
	double calcularArea() {
		double area = b*h/2;
		return area;
	}

}