Using Programming Languages other than VBA

Sub Example_Perimeter()
	' This example creates a region from an arc and a line.
	' It then returns the length of the perimeter of the region.
	Dim curves(0 To 1) As AcadEntity
	Dim arcObj As AcadArc
	Dim lineObj As AcadLine

	' Create the arc and line
	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

	' Create the region
	Dim regionObj As Variant
	regionObj = ThisDrawing.ModelSpace.AddRegion(curves)
	ZoomAll

	' Find the perimeter of the region.
	Dim perimeter As Double
	perimeter = regionObj(0).perimeter
	MsgBox "The perimeter of the region is " & regionObj(0).perimeter, , "Perimeter Example"

End Sub