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決定一個角度的正切值，角度以弧度做為單位指定。

Using the angle Alpha, the Tan function calculates the ratio of the length of the side opposite the angle to the length of the side adjacent to the angle in a right-angled triangle.

Tan(Alpha) = side opposite the angle/side adjacent to angle

```
Tan (Number As Double) As Double
```

Double

Number：要計算正切值的任意數值型表示式 (以弧度為單位)。

To convert degrees to radians, multiply by Pi/180. To convert radians to degrees, multiply by 180/Pi.

degrees=(radians*180)/Pi

radians=(degrees*Pi)/180

Pi is approximately 3.141593.

```
REM 在此示例中，以下條目均可用於直角三角形：
REM 角的對邊和角度 (以度為單位)，並計算角的鄰邊長度：
Sub ExampleTangens
REM Pi = 3.1415926 是預先定義的變數
Dim d1 As Double
Dim dAlpha As Double
d1 = InputBox("Enter the length of the side opposite the angle:","opposite")
dAlpha = InputBox("Enter the Alpha angle (in degrees):","Alpha")
Print "the length of the side adjacent the angle is"; (d1 / tan (dAlpha * Pi / 180))
End Sub
```