COVID restrictions in a class: how to space kids efficiently with minimal distance apart?

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At my kid's school, existing COVID regulations mandate a minimal distance of 1.5m between each child (excluding on the wall sides). This causes the classroom to not have sufficient space at the moment leading to a spillover in an adjacent class. Is simply placing kids in rows/columns the most efficient shape to pack as many children as possible in the room while respecting distance or is there a more optimal layout? Reworded: in a n x m rectangle, how many points are able to fit if each point is constrained to be at least d meters apart?