The quality or state of having all angles equal; the property of being equiangular.
From 'equiangular' plus the suffix '-ity,' which nominalized adjectives by expressing a quality or state. Common in scientific and mathematical terminology.
The equiangularity of a perfect square makes it one of the most useful shapes in architecture and engineering—equal angles mean equal stress distribution, which is why we see squares and rectangles everywhere in construction!
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