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# Math.Tan Method

Silverlight

Returns the tangent of the specified angle.

Namespace:  System
Assembly:  mscorlib (in mscorlib.dll)
```[SecuritySafeCriticalAttribute]
public static double Tan(
double a
)
```

#### Parameters

a
Type: System.Double

#### 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()
using System;

class Example
{
public static void Demo(System.Windows.Controls.TextBlock outputBlock)
{
double x = 1.0;
double y = 2.0;
double angle;
double result;

// Calculate the tangent of 30 degrees.
angle = 30;
radians = angle * (Math.PI / 180);
outputBlock.Text += String.Format("The tangent of 30 degrees is {0}.", result) + "\n";

// Calculate the arctangent of the previous tangent.
angle = radians * (180 / Math.PI);
outputBlock.Text += String.Format("The previous tangent is equivalent to {0} degrees.", angle) + "\n";

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

angle = radians * (180 / Math.PI);

outputBlock.Text += String.Format(line1, "\n") + "\n";
outputBlock.Text += String.Format(line2, x, y, radians) + "\n";
outputBlock.Text += String.Format(line3, angle) + "\n";
}
}
/*
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.
*/

```

#### Silverlight

Supported in: 5, 4, 3

#### Silverlight for Windows Phone

Supported in: Windows Phone OS 7.1, Windows Phone OS 7.0

#### XNA Framework

Supported in: Xbox 360, Windows Phone OS 7.0

For a list of the operating systems and browsers that are supported by Silverlight, see Supported Operating Systems and Browsers.