This example adds a triangle to myDocument. Because the first and last points have the same coordinates, the polygon is closed and filled. The color of the triangle's interior will be the same as the default shape's fill color.
Dim triArray(1 To 4, 1 To 2) As Single
triArray(1, 1) = 25
triArray(1, 2) = 100
triArray(2, 1) = 100
triArray(2, 2) = 150
triArray(3, 1) = 150
triArray(3, 2) = 50
triArray(4, 1) = 25 ' Last point has same coordinates as first
triArray(4, 2) = 100
Set myDocument = Worksheets(1)
myDocument.Shapes.AddPolyline triArray