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Why do builders use angles when building homes and offices?

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1. Most floors, walls and ceilings are 90 degrees to each other. Stairs and roofs are designed using angles. Trimming a doorway or window that is not 90 degrees is not easy and uses angles a lot. Figuring crown molding cuts.
2. A triangle is a stable structure that doesn't rack. So angles are used to strenghten members that are 90 degrees to each other to lock them in place. A roof is angled (pitched) so as to let water drain easily off of it. A 3,4,5 triangle is an easy way to establish a 90 degree angle