Recursion

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Triangle Numbers

In this example, we will look at triangle shapes such as the one shown here:
```
[]
[][]
[][][]
```
The n-th triangle number is the area of a triangle of width n.
From above, the third triangle number is 6.

Here is the outline of the class that we will develop:

class Triangle
{
public:
   Triangle(int w);
   int get_area() const;
private:
   int width;
};
Triangle::Triangle(int w)

{
   width = w;
}

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