The senior designer is at it again ? What a surprise . The AAs have been fine for years but let ' s change it for change ' s sake . <| sep |> I fall for it every single time but not once has it failed to make me laugh . Have an upvote . <| sep |> Cobra MK IV is the real MVP ! None of this Keelback nonsense . Tsss ! <| sep |> The floor area is not the same as footprint area . The floor area is a nett area , that is total area minus walls etc . Making floor area exactly 105 , 90 is a reverse engineering type of exercise . You need to take into account wall thickness . In Sketchup I would stick to cm as a basic unit . Draw a rectangle 10 x 10 , 6 m to start from . <| sep |> Perhaps they don ' t like switching the context like we could see here . That ' s definitely the case for me , English should have an unambiguous word describing independent countries only .