In layman’s terms please, no geometry/engineering jargon.
In: Engineering
Because it’s the only self supporting shape.
Imagine the sides of a triangle are sticks which are connected so that they can pivot.
Now push, pull, and twist on that triangle. No matter what you do, it stays a triangle.
If you try that with any other shape, the sides can move and pivot relative to each other while still staying connected but still allow the shape to collapse.
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