Rectangle and Triangle Shapes

An abstract base class Shape is provided with pure virtual methods getArea() and getPerimeter().

Create two classes that inherit from Shape:

Rectangle: Rectangle(double width, double height):
- getArea() returns width * height
- getPerimeter() returns 2 * (width + height)

Triangle (right triangle): Triangle(double base, double height, double hypotenuse):
- getArea() returns 0.5 * base * height
- getPerimeter() returns base + height + hypotenuse

Do NOT write a main function.