yeeah, that's not a word (or is certainly not a word in Latin, what with that k) but I can assume given prior context that this is some quasi-phonetic rendering of an Arabic term for reciprocity; honestly thrilled to be ushering "mutekesia" into English as another weirdly romanized loanword, this time essentially to mean "mutually proportional."

swear to god though book vi is like medieval Latin for babies compared to v; should be back to doing propositions by next week I hope <3

not actually a big deal or whatever (book vi is still for total babies okay) but I've rediscovered that parallelogram is spelled paralellograma here, with the l-groups swapped, and that is kind of annoying & just sucks to proofread.

beats calling it a "rectilinear superficies of equidistant sides" though so ig there's that
now's maybe a good time to note that "equidistant" here essentially means "parallel" as per its book 1 definition. which is also kind of annoying.

priorly: https://no-outlet.com/@ivlia/116336755502734396

Proposition 1: If there were one altitude of two rectilinear superficies of equidistant sides or of triangles, then either of them will be so much to the other as its base is to the base of the other.

#EuclideanGeometry