polymorphism with Abstract Classes: Shape Calculator System

In this problem, you will create a program that implements Circle and Triangle classes extending abstract class Shape, stores multiple shapes in a Shape array, calculates each area polymorphically, and displays the individual and total areas to standard output.

Learning Objective: Understand how to handle different shapes uniformly using polymorphism with abstract classes

Overview

Create Circle and Triangle extending abstract Shape class, store in array, and calculate areas polymorphically.

Specifications

• Shape (abstract): abstract double getArea() and String describe()
• Circle: Calculate area from radius (PI * r * r)
• Triangle: Calculate area from base and height (base * height / 2)
• Manage multiple shapes in Shape array and process with loop

Input

Shape type and parameters are provided

Output Format

Circle: area = 78.54
Triangle: area = 6.00
Total: 84.54