Name

Acos Function

Class

System.Math

Syntax

Math.Acos(d)
d

Use: Required

Data Type: Double or any valid numeric expression

A cosine, which is a number greater than or equal to -1 and less than or equal to 1

Return Value

A Double between 0 and pi that is the arccosine of d in radians

Description

Returns the arccosine of d in radians

Rules at a Glance

  • If d is out of range (less than -1 or greater than 1), Acos returns NaN.

  • This is a Shared member, so it can be used without creating any objects.

Programming Tips and Gotchas

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

VB .NET/VB 6 Differences

The Acos function did not exist in VB 6.

See Also

Asin Function, Atan Function, Atan2 Function

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