In layman’s terms please, no geometry/engineering jargon.
In: Engineering
One property of a triangle is that for any three side of any length, there is only one possible set of angles that are possible. Triangles are the only shape for which this is true. To distort a triangle you have to distort the lengths of the side, which, in practical terms, means either breaking or bending them. Any other shape can distort without stressing the sides.
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