simple program to compute the are of the circle using functions in Microsoft Visual Basic NET.

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Program Listing

Public Class Form1

    Dim area As Double
    Function Solve_Area(ByVal radius As Double) As Double

        radius = Single.Parse(Val(TextBox1.Text))

        area = Math.Round(3.14F * radius * radius, 2)

        Return area
    End Function

    Private Sub Button1_Click(sender As Object, e As EventArgs) Handles Button1.Click
        TextBox2.Text = Solve_Area(Val(TextBox1.Text))
    End Sub

    Private Sub Button3_Click(sender As Object, e As EventArgs) Handles Button3.Click
        End
    End Sub

    Private Sub Button2_Click(sender As Object, e As EventArgs) Handles Button2.Click
        TextBox1.Text = ""
        TextBox2.Text = ""
        TextBox1.Focus()
    End Sub
End Class

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