iNHERITANCE

Need help with this lab,
here is my code
i am getting this error message
when i use this piece of code

dim circle as new CCircle

Error      1      Argument not specified for parameter 'Rad_val' of 'Public Sub New(X_val As Integer, Y_val As Integer, Rad_val As Integer)'.      

Error      2      Argument not specified for parameter 'X_val' of 'Public Sub New(X_val As Integer, Y_val As Integer, Rad_val As Integer)'.

Error      3      Argument not specified for parameter 'Y_val' of 'Public Sub New(X_val As Integer, Y_val As Integer, Rad_val As Integer)'.

I am new in this oop . any help will be appreciated.
my teacher told me  to test both clasess.
what changes Do I need to make in order to make this lab to work...
thanks

'Create a class called CPoint that includes the following:
Public Class CPoint
#Region "Instance Variables"
    '"    Private integers mX and mY
    Private_X As Integer
   Private _Y As Integer
#End Region
 
#Region "Constructors"
    '    A default constructor that sets mX and mY to zero
    Public Sub New()
        _X = 0
        _Y = 0
    End Sub
    '"    A constructor that allows input for mX and mY
    Public Sub New(ByVal X_value As Integer, _
         ByVal Y_value As Integer)
 
        _X = X_value
        _Y = Y_value
    End Sub
#End Region
 
#Region "Properties"
    '    Public properties X   that returns mX
    Public Property X() As Integer
        Get
            Return _X
        End Get
 
        Set(ByVal Value As Integer)
            _X = Value
        End Set
    End Property
    'Public properties Y  that returns mY
    Public Property Y() As Integer
        Get
            Return _Y
        End Get
 
        Set(ByVal Value As Integer)
            _Y = Value
        End Set
    End Property
    'A Public Overridable ReadOnly Property Area that return 0 as a double
    Public ReadOnly Property Area() As Double
        Get
            Return 0
        End Get
    End Property
    '"    A Public ReadOnly Property Diameter that returns 0 as a double
    Public ReadOnly Property Diameter() As Double
        Get
            Return 0
        End Get
    End Property
 
#End Region
 
 
 
End Class
 
  this is the child class
 
'Create a class called CCircle that inherits CPoint that includes the following
Public Class CCircle
    Inherits CPoint
 
#Region "Instance Variables"
    '    Private double mRadius
    Private _Radius As Double
    Private _Area As Double
    Private _Circunference As Double
    Private _Diameter As Double
#End Region
 
#Region "Constructors"
    '    A constructor that accepts an X, Y and radius Value
    Public Sub New(ByVal X_val As Integer, ByVal Y_val As Integer, _
         ByVal Rad_val As Integer)
        X_val = _X
        Rad_val = _Radius
        Y_val = _Y
    End Sub
#End Region
 
 
 
#Region "Properties"
    '    A Radius Property
    Public Property Radius() As Double
        Get
            Return _Radius
        End Get
 
        Set(ByVal Value As Double)
            _Radius = Value
        End Set
    End Property
 
    '    Create Area, Circumference and Diameter Properties
 
    Public Overloads Property Area() As Double
        Get
            Return _Area
        End Get
 
        Set(ByVal Value As Double)
            _Area = Value
        End Set
    End Property
 
 
    Public Property circunference() As Double
        Get
            Return _Circunference
        End Get
 
        Set(ByVal Value As Double)
            _Circunference = Value
        End Set
    End Property
    Public Overloads Property Diameter() As Double
        Get
            Return _Diameter
        End Get
        Set(ByVal value As Double)
            _Diameter = value
        End Set
    End Property
#End Region
    '    Ovveride the ToString Function to return something that looks like Center = [10, 10]; Radius = 20
 
 
#Region "Functions"
    Public Function CalculateDiameter() As Double
        Return Radius * 2
    End Function
 
    Public Function CalculateCircmuference() As Double
        Return CalculateDiameter() * Math.PI
    End Function
 
    Public Function CalculateArea() As Double
        Return Radius * Radius * Math.PI
    End Function
#End Region
 
 
 
 
 
 
    Public Overrides Function ToString() As String
        Return Convert.ToString(X) & ", " & Convert.ToString(Y) & _
         vbNewLine & "Radius = " & _Radius
    End Function
End Class

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