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Public Class Form1
Private Sub Button1_Click(sender As Object, e As EventArgs) Handles Button1.Click
Const PI As Single = 3.14
Dim r As Integer = 100
Label1.Text = "圓周率" & PI
Label2.Text = "半徑" & r
Label3.Text = "圓周長" & 2 * PI * r
Label4.Text = "園面積" & PI * r ^ 2
End Sub
End Class
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