目录

# Tan Function

计算一个角度的正切值，角度以弧度为单位。

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

### 语法:

    Tan (Number As Double) As Double

### 返回值:

Double

### 参数:

「数字」:要计算正切值的任意数字表达式 (以弧度为单位)。

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.

### 错误代码:

5 无效的过程调用

### 示例:

    ' 在此示例中，以下项均针对直角三角形:
    ' 角的对边和角度 (以度为单位)，并根据它们来计算角的邻边长度:
    Sub ExampleTangens
    ' Pi = 3.1415926 是预定义变量
    Dim d1 As Double
    Dim dAlpha As Double
        d1 = InputBox("Enter the length of the side opposite the angle:","opposite")
        dAlpha = InputBox("请输入 Alpha 角度 (单位为度):","Alpha")
        Print "the length of the side adjacent the angle is"; (d1 / tan (dAlpha * Pi / 180))
    End Sub

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Atn Function

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