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์ซ์ ์์ ์ํฌ ํ์ ํธ๋ฅผ ๊ตฌํ๋ ์ผ๊ฐ ํจ์์ ๋๋ค. ๋ฐํ ๊ฐ์ ๋ฒ์๋ -Pi/2์์ +Pi/2 ์ฌ์ด์ ๋๋ค.

The arctangent is the inverse of the tangent function. The Atn Function returns the angle "Alpha", expressed in radians, using the tangent of this angle. The function can also return the angle "Alpha" by comparing the ratio of the length of the side that is opposite of the angle to the length of the side that is adjacent to the angle in a right-angled triangle.

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

```
Atn (Number As Double) As Double
```

Double

Number: Any numerical expression that represents the ratio of two sides of a right triangle. The Atn function returns the corresponding angle in radians (arctangent).

๋ผ๋์์ ๋๋ก ๋ณํํ๋ ค๋ฉด ๋ผ๋์์ 180/pi๋ฅผ ๊ณฑํฉ๋๋ค.

degree=(radian*180)/pi

radian=(degree*pi)/180

Pi is here the fixed circle constant with the rounded value 3.14159. Pi is a Basic mathematical constant.

```
REM The following example calculates for a right-angled triangle
REM the angle Alpha from the tangent of the angle Alpha:
Sub ExampleAtn
REM Pi = 3.14159๋ ๋ฏธ๋ฆฌ ์ ์๋ ์์์
๋๋ค.
Dim d1 As Double
Dim d2 As Double
d1 = InputBox("Enter the length of the side adjacent to the angle: ","Adjacent")
d2 = InputBox$("๊ฐ๋ ๋ง์ํธ ๋ณ ๊ธธ์ด ์
๋ ฅ: ","Opposite")
Print "The Alpha angle is"; (atn (d2/d1) * 180 / Pi); " degrees"
End Sub
```