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How do I Construct these Loci?

PA + PB = k 

PA + PB + PC = k paul martin said...

Not sure if u solved this but saw the word ellipse and referring back umpteen yrs to when I was at Abdn Uni there was work on representing such for various reasons. (I cannot remember just now ...). Anyway a good place to start is the Geometer https://en.wikipedia.org/wiki/Harold_Scott_MacDonald_Coxeter
& before him the papers on the cyclide by James Clerk Maxwell & the literature around that. This may be difficult to access as it is over a hundred years old.


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