They're adjoining consecutive English alphabet triplets. Whatever mathematical significance they have would be demonstrated by the figures you haven't shown us.
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On the basis of information provided all that can be said is that the second triplet of letters precedes the first.
There is insufficient information for us to answer this question. Please edit the question to include more context or relevant information. We have no idea what triangles uvw and xyz are! It would also be useful to develop the habit of checking your questions for completeness before posting them.
xyz
That is a simply awful construction. Some revisions: This <fill in the blank> has been approved by XYZ. This <fill in the blank> has been authorized by XYZ. This <fill in the blank> has been issued under the authority of XYZ. This <fill in the blank> is issued and authorized by XYZ. Or perhaps you meant: Pending the approval of XYZ, this <fill in the blank> will be issued.
False
It is the analytic geometry formula for finding the angle between two planes.