Implement a class named Polygon has two member variables width and height both of type int, and has two member functions as follows:

set$\_$values$\_$Function to set width and height

area$-$Value$-$returning function to return the area of the class instance as number $0$

Using a Polygon class as a base class, implement two derived classes simulating a Triangle and Rectangle, each redefining a function to calculate the area accordingly.

Write a function to handle the polymorphism $($using virtual functions$)$ in calculating the area of three above classes' instances.

Then write the main class that creates instances of three above classes $($one for each class$),$ passes values $4$ and $5$ to their member functions set$\_$values $($i$.$e$.,$ set$\_$values $(4,5)),$ and called the function written in $3.$ to demonstrate that the areas were calculated correctly for e$$ch class instance $($sample output as a below picture$).$

Area as a Polygon object: $0$

Area as a Triangle object: $10$

Area as a Rectangle object: $20$

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