abstract class Shape {
              public abstract double calculateArea();
              public abstract double calculatePerimeter();
              }
              
              class Circle extends Shape {
              private double radius;
              
              public Circle(double radius) {
              this.radius = radius;
              }
              
              public double calculateArea() {
              return Math.PI * Math.pow(radius, 2);
              }
              
              public double calculatePerimeter() {
              return 2 * Math.PI * radius;
              }
              }
              
              class Triangle extends Shape {
              private double base;
              private double height;
              private double sideA;
              private double sideB;
              
              public Triangle(double base, double height, double sideA, double sideB) {
              this.base = base;
              this.height = height;
              this.sideA = sideA;
              this.sideB = sideB;
              }
              
              public double calculateArea() {
              return 0.5 * base * height;
              }
              
              public double calculatePerimeter() {
              return base + sideA + sideB;
              }
              }
              
              class area_perimeter{
              public static void main(String[] args) {
              Shape circle = new Circle(5.0);
              System.out.println("Circle Area: " + circle.calculateArea());
              System.out.println("Circle Perimeter: " + circle.calculatePerimeter());
              
              Shape triangle = new Triangle(5.0, 10.0, 3.0, 4.0);
              System.out.println("Triangle Area: " + triangle.calculateArea());
              System.out.println("Triangle Perimeter: " + triangle.calculatePerimeter());
              }
              }