Elm geometry, move Frame2d along Arc2d

I’m using Elm geometry and I’ve placed an Arc2d in a Frame2d, and now I wonder if there’s a way to calculate new Frame2ds along the arc, specifically at the endpoint. I saw the Nondegenerate tangent function but I don’t understand the float parameter it wants. Would that be, like, 1.0 at the endpoint? Is there maybe a shortcut for calculating the Frame2d directly? Any help appreciated, learner here.

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