[Dr. Geo] supplementary angle (defined by 3 points)

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Hello,

When I define an angle using the method angle:to:to: (instance method from the 
DrGeoSketch class), it returns a DrGWrappedValue with a "mathItem" instance of 
the class DrGAngle3PtsOrientedItem (I believe).

Is it possible to create the supplementary angle (180 degrees - angle) by a 
method provided by the DrGeoSketch class please ?

Thanks!
David Stes