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* parabolic arc segment - _IfcAlignmentVerticalSegmentTypeEnum_ .PARABOLICARC. which can describe symmetric parabolas, unsymmetric parabolas can be created by defining two symmetric parabolas segments
* line segment - _IfcAlignmentVerticalSegmentTypeEnum_ .CONSTANTGRADIENT.
* circular arc segment - _IfcAlignmentVerticalSegmentTypeEnum_ .CIRCULARARC.
* parabolic arc segment - _IfcAlignmentVerticalSegmentTypeEnum_ .PARABOLICARC. which can describe symmetric parabolas. Unsymmetric parabolas can be created by defining two symmetric parabolas segments
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Asymmetric? Or is this specific idiom?

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To my knowledge the terms are interchangeable.

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Asymmetric is more common in my experience but unsymmetric is ok to leave as-is. I have only encountered them in preparation for the PE exam - never in actual practice.

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