Math.Acos Method (Double)


Returns the angle whose cosine is the specified number.

Namespace:   System
Assembly:  mscorlib (in mscorlib.dll)

static member Acos : 
        d:float -> float


Type: System.Double

A number representing a cosine, where d must be greater than or equal to -1, but less than or equal to 1.

Return Value

Type: System.Double

An angle, θ, measured in radians, such that 0 θπ


NaN if d < -1 or d > 1 or d equals NaN.

Multiply the return value by 180/Math.PI to convert from radians to degrees.

The following example uses the Acos method to assist in the computation of the inner angles of a given trapezoid.

No code example is currently available or this language may not be supported.

Universal Windows Platform
Available since 4.5
.NET Framework
Available since 1.1
Portable Class Library
Supported in: portable .NET platforms
Available since 2.0
Windows Phone Silverlight
Available since 7.0
Windows Phone
Available since 8.1
Return to top
Was this page helpful?
(1500 characters remaining)
Thank you for your feedback
© 2015 Microsoft