Hi, PLSchrader,
I don't think you can do this in Publisher. Well, yes, you can. But you'll need to make four triangles, give them different colors, rotate them, and then pull them all together so they look like a square. Make sure they have the same height and width. Attached is my try (I hope).
You wrote it all needs to stay together as a square, so select all pieces and group them together. Now they'll stay together.
Last edited by DBlomgren; 07-14-2016 at 06:43 PM.
Reason: Add detail.
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