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# Can you hint where is my error? The editor says i need to have a return type

I already assign the result to a type double, did i miss something here?

RightTriangle.cs
```namespace Treehouse.CodeChallenges
{
class RightTriangle
{
public static CalculateHypotenuse(double Height, double V)
{
Height=5.0;
V=20.0;

double res = Height / Math.Sin(V);
return res;
}
}
}
```

Hey Travis, your CalculateHypotenuse method doesn't have a return type. You need to specify a return type like double, void, etc.

Travis, here's a suggestion:

```using System;

namespace Treehouse.CodeChallenges
{
class RightTriangle
{
public static double CalculateHypotenuse(double a, double b)
{
return Math.Sqrt(a * a + b * b);
}
}
}
```

In your code, you did not add the `using` directive or the return type (`double`). The `using` directive is needed if you are to use the `Math` class without its associated namespace; otherwise, you need to add `System` to `Math` (`System.Math`). The return type (`double`) is what the `CalculateHypotenuse` method should return, so add it before `CalculateHypotenuse`.

Moreover, Pythagoras' Theorem is `a2 + b2 = c2`. Use `a` and `b` as parameters (to save on typing).

That said, you don't have to store the value in a variable, if you want to further save on typing.

I hope this helps! If you have any further questions, feel free to reach out.

Never Stop Learning

Not a problem, Travis. If an answer helped you make sure to mark it as the Best Answer or at least upvote it.