Circle1.java

class Circle
{
 public double radius;
 public double area()
 {
 return Math.PI*radius*radius;
 }
 public double perimeter()
 {
 return 2*Math.PI*radius;
 }
 public double circumference()
 {
 return perimeter();
 }
}
class Cylinder extends Circle
{
 public double height;
 public double volume()
 {
 return area()*height;
 } 
}
public class Circle1
{
 public static void main(String args[])
 {
 Cylinder c=new Cylinder();
 c.radius=7;
 c.height=10;
 System.out.println(c.area());
 System.out.println(c.volume());
 }
}