Cutting squares or circles in tiles can be a bit fiddly, but well worth the effort.
No matter what size area you work on, you will generally need to cut at least one tile.
Most tiled areas require at least one hole to be cut. The key to cutting rectangles and squares in tiles is to avoid cutting beyond the corners.
Firstly, Score the circle outline.
Mark the circle on the tiles then score the profile with an angle grinder.
Before removing the excess tile, make short cuts on both sides of the semicircle (A and B).
Connect the cuts (C) by making a series of progressively deeper shallow cuts.