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.
Assembly: mscorlib (in mscorlib.dll)
Parameters
- d
- Type: System.Double
A number.
Return Value
Type: System.DoubleValue of d | Returns |
|---|---|
Zero, or positive | The positive square root of d. |
Negative |
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