Math.Atan returns the angle whose tangent is the specified number.
Imports System Class Sample Public Shared Sub Main() Dim x As Double = 1.0 Dim y As Double = 2.0 Dim angle As Double Dim radians As Double Dim result As Double angle = 30 radians = angle *(Math.PI / 180) result = Math.Tan(radians) Console.WriteLine("The tangent of 30 degrees is {0}.", result) radians = Math.Atan(result) angle = radians *(180 / Math.PI) Console.WriteLine("The previous tangent is equivalent to {0} degrees.", angle) End Sub 'Main End Class 'Sample