The Medway Handyman wrote:
Recently tiled a floor using 330 x 330mm tiles. When it came to the border
tiles I used the standard scribing technique e.g. the tile to be cut was
laid over the adjacent whole tile & marked using another whole tile.
One wall was at an angle of maybe 35 - 40 degrees to the whole tiles & when
I scribed the first tile it was around 20mm too small. Next one I just
marked & compared by measuring the distances & sure enough it would have
been 20mm out.

Can't get my brain around this. How can it work on 'square' walls ( which
are always at a slight angle) but be so far out on an angled wall?

Is it the extreme angle?

Yes. If the whole tile is lined up against the wall then its sides are
not parallel to the line of the tiling. So the distance from wall to
tile-to-be-cut is not the true distance (the hypotenuse of a triangle
rather than a right-angled side).

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djc