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To support the structure. But they don't have to be perpendicular.

They are not perpendicular always but in most cases they are because this is the most stable shape against the gravity of earth. Secondly it gives more room than any other shape.

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Q: Why must walls be perpendicular?
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Objects like walls, poles, and trees must be perpendicular to the ground if the ground is flat. This ensures that they are standing upright and stable on the level surface.


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