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This works. This is exactly the result expected. Symbolization can still be grouped or separated by FID's as needed. I will try to post these steps above. Thank you sir!
This is a good improvement, thank you. I'm not as familiar with WKT, but your expression works. I will have to parse it out for my own learning in a bit. The only problem now is splitting the result. I know I could have used some vector geoprocessing using one side/triangle in conjunction with the original, but is it possible to split your result into their constituent parts within the expression? It may be too much. If so I can definitely work with this. Thanks again.
Your updated expression at the bottom of your response makes sense to me, but still produces one half / triangle. I suspect that it may only be possible to create one type of geometry per expression. I might be wrong.
OK, these are good alternatives. I was aware of the Union option in geoprocessing tools, but wanted to see if I could make this a one-step process. In terms of expressions, it doesn't seem possible to create multiple geometries. This is something I wasn't sure of. If true, then a model would be a better way. For e.g. this doesn't work, unless my syntax is wrong: union(make_triangle(point_n($geometry,1), point_n($geometry,2),point_n( $geometry,3)),(make_triangle(point_n($geometry,3), point_n ($geometry,4),point_n( $geometry,1))))
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