Sqrt Method

Math.Sqrt Method

[ This article is for Windows Phone 8 developers. If you’re developing for Windows 10, see the latest documentation. ]

Returns the square root of a specified number.

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

'Declaration
Public Shared Function Sqrt ( _
	d As Double _
) As Double

Parameters

d
Type: System.Double
A number.

Return Value

Type: System.Double

Value of d

Returns

Zero, or positive

The positive square root of d.

Negative

NaN

If d is equal to NaN or PositiveInfinity, that value is returned.

The square root of the area of a square represents the length of any side of the square. The following example displays the area of some cities in the United States and gives an impression of each city's size if it were represented by a square.


Module Example
   Public Sub Demo(outputBlock As System.Windows.Controls.TextBlock)
      outputBlock.FontFamily = New System.Windows.Media.FontFamily("Courier New")

      ' Create an array containing the area of some squares.
      Dim areas() As Tuple(Of String, Double) = 
                     { Tuple.Create("Sitka, Alaska", 2870.3), 
                       Tuple.Create("New York City", 302.6), 
                       Tuple.Create("Los Angeles", 468.7), 
                       Tuple.Create("Detroit", 138.8), 
                       Tuple.Create("Chicago", 227.1), 
                       Tuple.Create("San Diego", 325.2) }

      outputBlock.Text += String.Format("{0,-18} {1,14:N1} {2,30}", "City", "Area (mi.)", 
                                        "Equivalent to a square with:") + vbCrLf
      outputBlock.Text += vbCrLf
      For Each area In areas
        outputBlock.Text += String.Format("{0,-18} {1,14:N1} {2,14:N2} miles per side", 
                                          area.Item1, area.Item2, 
                                          Math.Round(Math.Sqrt(area.Item2), 2)) + vbCrLf        
      Next
   End Sub
End Module
' The example displays the following output:
'    City                   Area (mi.)   Equivalent to a square with:
'    
'    Sitka, Alaska             2,870.3          53.58 miles per side
'    New York City               302.6          17.40 miles per side
'    Los Angeles                 468.7          21.65 miles per side
'    Detroit                     138.8          11.78 miles per side
'    Chicago                     227.1          15.07 miles per side
'    San Diego                   325.2          18.03 miles per side


Windows Phone OS

Supported in: 8.1, 8.0, 7.1, 7.0

Windows Phone

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