Can someone please help? it should be written in C++. it should have 7 separate files: shape.h and shape.cpp; triangle.h and triangle.cpp; rectangle.h and rectangle.cpp and the main function.

1. Define a base class called Shape containing: - a constructor, - two protected variables: double length, double height, and - a pure virtual function getArea() with a return type of double. Define two derived classes Rectangle and Triangle, that implements the getArea() function to return the appropriate area values. Ensure that the derived classes contain constructors. Define a main that creates a Rectangle type object and a Triangle type object, assigns appropriate length and height values to evaluate the area and show as outputs. You may use the set and get methods as needed