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# Computed Properties

Its probably way off wrong, i just dont understand it.. Thank you.

Square.cs
```namespace Treehouse.CodeChallenges
{
class Square : Polygon
{
public double SideLength { get; private set; }

public Square(double sideLength) : base(4)
{
SideLength = sideLength;
}
public Square Area
{
get {
return SideLength*4;
}
}
}
}
```
Polygon.cs
```namespace Treehouse.CodeChallenges
{
public class Polygon
{
public int NumSides { get; private set; }

public Polygon(int numSides)
{
NumSides = numSides;
}
}
}
```

It's actually not way off. There are only two issues, and only one of those are code related.

The first issue is this line:

```public Square Area
```

In that line you declare a property called `Area` with a return type of `Square`. The issue is that it does not actually returns a `Square`, but a `double`. So you need to change the return type to reflect that.

The second issue is your math. The instructions tell you to return the area of the square. That is done by squaring the side length, not by multiplying the length by 4.

Squaring in case you don't know basically just means to multiply a number by itself. So `SideLength * SideLength` is what the Area property should return.

If you fix those two issues then your code will work.