Export (0) Print
Expand All

Math.Tan Method

Returns the tangent of the specified angle.

Namespace:  System
Assembly:  mscorlib (in mscorlib.dll)

'Declaration
Public Shared Function Tan ( _
	a As Double _
) As Double

Parameters

a
Type: System.Double

An angle, measured in radians.

Return Value

Type: System.Double
The tangent of a. If a is equal to NaN, NegativeInfinity, or PositiveInfinity, this method returns NaN.

The angle, a, must be in radians. Multiply by Math.PI/180 to convert degrees to radians.

The following example demonstrates how to calculate the tangent of an angle and display it to the console.

' This example demonstrates Math.Atan() 
'                           Math.Atan2() 
'                           Math.Tan() 
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 

      ' Calculate the tangent of 30 degrees.
      angle = 30
      radians = angle *(Math.PI / 180)
      result = Math.Tan(radians)
      Console.WriteLine("The tangent of 30 degrees is {0}.", result)

      ' Calculate the arctangent of the previous tangent.
      radians = Math.Atan(result)
      angle = radians *(180 / Math.PI)
      Console.WriteLine("The previous tangent is equivalent to {0} degrees.", angle)

      ' Calculate the arctangent of an angle. 
      Dim line1 As [String] = "{0}The arctangent of the angle formed by the x-axis and " 
      Dim line2 As [String] = "a vector to point ({0},{1}) is {2}, " 
      Dim line3 As [String] = "which is equivalent to {0} degrees."

      radians = Math.Atan2(y, x)
      angle = radians *(180 / Math.PI)

      Console.WriteLine(line1, Environment.NewLine)
      Console.WriteLine(line2, x, y, radians)
      Console.WriteLine(line3, angle)
   End Sub 'Main
End Class 'Sample

'This example produces the following results: 

'The tangent of 30 degrees is 0.577350269189626. 
'The previous tangent is equivalent to 30 degrees. 

'The arctangent of the angle formed by the x-axis and 
'a vector to point (1,2) is 1.10714871779409, 
'which is equivalent to 63.434948822922 degrees. 
'

.NET Framework

Supported in: 4.5, 4, 3.5, 3.0, 2.0, 1.1, 1.0

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

Portable Class Library

Supported in: Portable Class Library

.NET for Windows Store apps

Supported in: Windows 8

.NET for Windows Phone apps

Supported in: Windows Phone 8.1, Windows Phone Silverlight 8.1, Windows Phone Silverlight 8

Windows Phone 8.1, Windows Phone 8, Windows 8.1, Windows Server 2012 R2, Windows 8, Windows Server 2012, Windows 7, Windows Vista SP2, Windows Server 2008 (Server Core Role not supported), Windows Server 2008 R2 (Server Core Role supported with SP1 or later; Itanium not supported)

The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.

Show:
© 2014 Microsoft