/*
	Class:	Shape
	Author: Mr. F
	Date: 9/25/07
*/

public abstract class Shape
{
	private double xCenter, yCenter;
	
	//constructs a shape with the given center
	public Shape(double x, double y) {
		xCenter = x;
		yCenter = y;
	}
	
	//returns the area of the shape
	public abstract double area();
	
	//returns the perimeter of the shape
	public abstract double perimeter();
	
	//returns the number of sides of the shape
	public abstract int numberOfSides();
	
	//returns the ratio of the area to the perimeter
	public double ratio() {
		return area() / perimeter();
	}
	
	public double getXCenter() {
		return xCenter;
	}
	
	public double getYCenter() {
		return yCenter;
	}
}