Define an abstract class Shape with abstract method CalculateSurface() and fields width and height. Define two additional classes for a triangle and a rectangle, which implement CalculateSurface(). This method has to return the areas of the rectangle (hei
Define an abstract class Shape with abstract method CalculateSurface() and fields width and height. Define two additional classes for a triangle and a rectangle, which implement CalculateSurface(). This method has to return the areas of the rectangle (hei
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