Atn Function

Atn()`number`

`number`

Use: Required

Data Type: Numeric

Any numeric expression, representing the ratio of two sides of a right angle triangle.

The return value is a Double representing the arctangent of
* number* in the range -pi/2 to pi/2
radians.

Takes the ratio of two sides of a right triangle
(* number*) and returns the corresponding
angle in radians. The ratio is the length of the side opposite the
angle divided by the length of the side adjacent to the
angle.

If no number is specified, a runtime error is generated.

The return value of

*Atn*is in radians, not degrees.

<% Const Pi = 3.14159 Dim dblSideAdj, dblSideOpp Dim dblRatio, dblAtangent, dblDegrees dblSideAdj = 50.25 dblSideOpp = 75.5 dblRatio = dblSideOpp / dblSideAdj dblAtangent = Atn(dblRatio) ' convert from radians to degrees dblDegrees = dblAtangent * (180 / Pi) Response.Write dblDegrees & " Degrees" %>

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

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

Don’t confuse

*Atn*with the cotangent.*Atn*is the inverse*trigonometric*function of*Tan*, as opposed to the simple inverse of*Tan*.

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