Code6.java

abstract class Shape {
    public abstract double calculateArea();
    public abstract double calculatePerimeter();
}

class Triangle extends Shape {
    private double side1;
    private double side2;
    private double side3;

    public Triangle(double side1, double side2, double side3) {
        this.side1 = side1;
        this.side2 = side2;
        this.side3 = side3;
    }

    @Override
    public double calculateArea() {
        double s = (side1 + side2 + side3) / 2;
        return Math.sqrt(s * (s - side1) * (s - side2) * (s - side3));
    }

    @Override
    public double calculatePerimeter() {
        return side1 + side2 + side3;
    }

    public String getType() {
        if (side1 == side2 && side2 == side3) {
            return "Equilateral";
        } else if (side1 == side2 || side2 == side3 || side1 == side3) {
            return "Isosceles";
        } else {
            return "Scalene";
        }
    }
}

public class Code6 {
    public static void main(String[] args) {
        Triangle triangle = new Triangle(3, 4, 5);

        System.out.println("Area of the triangle: " + triangle.calculateArea());
        System.out.println("Perimeter of the triangle: " + triangle.calculatePerimeter());
        System.out.println("Type of the triangle: " + triangle.getType());
    }
}