$1.$ 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

$0$

$2.$ 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.

$3.$ Write a function to handle the polymorphism $($using virtual functions$)$ in calculating the

area of three above classes$$ instances.

$4.$ 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 each class instance $($sample output as a below picture$).$