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# I don't understand the last code challenge

I really don't understand what I'm doing here in the code challenge I've attempted to do it though I'm still struggling.

RightTriangle.cs
```namespace Treehouse.CodeChallenges
{
class RightTriangle
{
public static double CalculateHypotenuse
}
}
```

You've got a good start by declaring the function as returning a double. Now declare the arguments. The instructions say "The method should take two parameters of type double..."

Then for the body, they say "The Pythagorean theorem will come in handy.." You may need to look this up, it's just a math formula that will let you know what you need to do with the arguments to create the right result. Finally, return that result.

Steven Parker are you on social media? if yes what your handles?

No, I'm not a social media user. But I do visit the forum here frequently.

PLUS
```namespace Treehouse.CodeChallenges
{
class RightTriangle
{
public static double CalculateHypotenuse
{
return double
}
}
}
// This is my code so far , now my question is about the math formula do I need to use it or write it in my code.
```

using System; namespace Treehouse.CodeChallenges { class RightTriangle { public static double CalculateHypotenuse(double side1, double side2) { double hypotenuse;

```        hypotenuse = //formula goes here

return hypotenuse;
}

}
```

}