Help with modeling architecture

Howdy.

I’m working on modelling a floor of a skyscraper, and the skyscraper is a right triangle. However, in blender, I am having trouble putting walls on the angled sides, I am trying to keep them a consistent width as the walls on the 90 degree side. As you can see, on the left, on the 90 degree angle there is a little bit of wall to separate the windows. I can’t get one like this to fit correctly in the 45 degree angles. Is there a better way to go about doing this?

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