Added check in GetArcCentre() method of the interface class to check the object type and call either the HArc or HCircle methods as appropriate.  (I needed to get the centre of a circle and I didn't want to change the interface.  I figured that a circle is just a special case of an arc so I used this routine).
Added check in GetArcCentre() method of the interface class to check the object type and call either the HArc or HCircle methods as appropriate.  (I needed to get the centre of a circle and I didn't want to change the interface.  I figured that a circle is just a special case of an arc so I used this routine).

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