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# Sin Function

傳回一個角度的正弦值，角度以弧度為單位指定，結果在 -1 到 1 之間。

Using the angle Alpha, the Sin function returns the ratio of the length of the opposite side of an angle to the length of the hypotenuse in a right-angled triangle.

Sin(Alpha) = side opposite the angle/hypotenuse

### Syntax:

    Sin (Number As Double) As Double

### Return type:

Double

### Parameters:

Number：數值型表示式，用於定義要計算正弦值的角度 (以弧度為單位)。

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

degrees=(radians*180)/Pi

radians=(degrees*Pi)/180

Pi is approximately 3.141593.

### 錯誤代碼：

5 無效的程序呼叫

### Example:

    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)，並計算斜邊長度：
    Sub ExampleSine
    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 opposite side:","Opposite Side")
        dAlpha = InputBox$ "Enter the angle Alpha (in degrees):","Alpha")
        Print "The length of the hypotenuse is"; (d1 / sin (dAlpha * Pi / 180))
    End Sub

相關主題

Atn Function

Cos Function

Tan Function

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