Trigonometry help

[RonMex]

i am trying to find the sin (any number *Pi) but for some reason its not working. the result i am getting is the answer of (sin(any number)) * pi
here is an example of my code:

Answer.Text = Sin(variable1 * Math.PI)

****note variable1 is user input


thank you for all the help so far, really appreciate it.

 

[JohnH]

Answer.Text = Sin(variable1 * Math.PI)

The inner expression is evaluated first, then Sin of that.
It is possible that you are confused about Math.Sin operating in radians.

 

[InertiaM]

Are you sure that is what the problem is? Have you considered the fact that Math.Sin expects a value in Radians and not Degrees?

Math.Sin Method (System)

 

[RonMex]

The inner expression is evaluated first, then Sin of that.
It is possible that you are confused about Math.Sin operating in radians.

i know it operates in radians. when i try sin(2*pi) i should get 0. but i get 2.8566.... instead.

 

[InertiaM]

Well, my code gives 0 (or as close to 0 as possible).

        Dim AngleInRadians As Double = 2.0
        Dim Result As Double = Math.Sin(AngleInRadians * Math.PI)
        MessageBox.Show(Result.ToString)

 

[RonMex]

Well, my code gives 0 (or as close to 0 as possible).

        Dim AngleInRadians As Double = 2.0
        Dim Result As Double = Math.Sin(AngleInRadians * Math.PI)
        MessageBox.Show(Result.ToString)

this is similar to my code instead of declaring a variable to be a number, it can be a user input. it works when a put 3.14159 instead of math.pi. its weird