Installing traveratine on a spa radius?

if these square edged travertine have cut pcs radius. in case have cut length ways , stood on end. being 5 5/8" wide , may make radius fine.
if tumbled travertine can same thing, round off edges , seal edged need deal stone prior installation.
questions can e mail me through avatar , check qualifications there. gl

i want install traveratine on spa wall half round, not know how figure angle cut each side of tile. outside radius 168" , inside radius 128" . wall 17 in width , tiles measure 5 5/8" 18".

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