Visual Basic Math Function : Atn

Purpose : Return the arctangent of a numeric expression.

Syntax :
Atn ( dblExpression )

dblExpression : Numeric expression for which you want to return the arctangent

Dim dblAngle as Double, dblRatio as Double
dblAngle = Atn ( dblRatio )

Atn is a Trigonometric Function. The arctangent is the inverse of tangent. The arctangent of a number gives the size of the angle for which the number is the tangent.