public class sphere extends Shape {
	
	private double r;
	
	public sphere(String color, double a, double c, double r) {
		super (color);
		volume();
		surfaceArea();
		this.r = r;
	}
	
	public void volume () {
		volume = (4/3) * super.pi * Math.pow(r, 3);
	}
	
	public void surfaceArea() {
		surfaceArea = 4 * super.pi * Math.pow(r, 2);
	}
}