How do I fill a 90 by 90 square using Minecraft commands?

Im trying to build a base for an ice hotel but cant fill the 90x90 floor for it with the fill command. What are the coordinates for a 90x90 square floor on the ground?


You use/fill works by giving it two x y z locations, which correspond to the two opposite corners of a cuboid.

If you are standing in the center of the place you want to make a floor, the command is /fill ~-45 ~-1 ~-45 ~45 ~-1 ~15 minecraft:your desired block.