Sub Example_Perimeter()
    'Этот пример создает область из дуги и линии.
    'Затем возвращает длину периметра области.
    Dim curves(0 To 1) As AcadEntity
    Dim arcObj As AcadArc
    Dim lineObj As AcadLine
    
    'Создайте дугу и линию
    Dim centerPoint(0 To 2) As Double
    Dim radius As Double
    Dim startAngle As Double
    Dim endAngle As Double
    centerPoint(0) = 5#: centerPoint(1) = 3#: centerPoint(2) = 0#
    radius = 2#
    startAngle = 0
    endAngle = 3.141592
    Set arcObj = ThisDrawing.ModelSpace.AddArc(centerPoint, radius, startAngle, endAngle)
    Set lineObj = ThisDrawing.ModelSpace.AddLine(arcObj.startPoint, arcObj.endPoint)
    Set curves(0) = arcObj
    Set curves(1) = lineObj
    
    'Создайте область
    Dim regionObj As Variant
    regionObj = ThisDrawing.ModelSpace.AddRegion(curves)
    ZoomAll
    
    'Найдите периметр области.
    Dim perimeter As Double
    perimeter = regionObj(0).perimeter
    MsgBox "Периметр области " & regionObj(0).perimeter, , "Perimeter Пример"
    
End Sub