public class Rectangle implements Base, Quadrilateral {
	private double a;
	private double b;

	public Rectangle(double a, double b) {
		this.a = a;
		this.b = b;
	}

	public double getE() {
		return Math.sqrt(a * a + b * b);
	}

	public double getF() {
		return getE();
	}

	public double getArea() {
		return a * b;
	}

	public double getPerimeter() {
		return 2 * a * b;
	}
}