The StartAngle property returns or specifies the start angle of an arc or pie.
Examples:
The following VBA example sets the start angle of the pie or arc to be 90° greater than its end angle (making sure that the angle does not exceed the limit of 360°).
Sub Test()
Dim s As Shape
Dim a As Double
Set s = ActiveShape
If s.Type = cdrEllipseShape Then
a = s.Ellipse.EndAngle + 90
If a >= 360 Then a = a - 360 * Fix(a / 360)
s.Ellipse.StartAngle = a
End If
End Sub