Aye aye, me hearties, fire broadside and prepare to board...

I can only assume the shape you are dealing with is an irregular quadrilateral of some kind. Imagine it is a truncated triangle, so you have a broad base, two lines that approach each other as you near the top, and a narrow top line. Now, turn this truncated-triangle irregular quadrilateral on its side so the short top and narrow bottom (my mind is boggling at the thought of the navel revealed by the short top ...) become the short and broad sides respectively. Each of the sides will have two angles, one at each corner of the quadilateral, which could be called the (top and bottom) short-side and broad-side angles.

Do you actually have the drawings?

Being less light-hearted, maybe you're dealing with the corner elements of a composite-panel cladding system such as those shown in the image below, where, as you can see, you have wide and narrow elements, so you could be looking at wide/narrow angle (element) or angle (piece/element), narrow/wide.

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Note added at 2 hrs (2023-10-06 22:39:36 GMT)
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Note added at 12 hrs (2023-10-07 08:09:28 GMT)
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Drawings to be found on p.23 of the CSTB Avis Technique for Reynobond cladding here: https://www.cstb.fr/pdf/atec/GS02-C/AC041083.PDF