Having all angles equal, as in certain geometric shapes like squares or equilateral triangles.
From Latin 'aequus' (equal) plus 'angulus' (angle), literally 'equal-angled.' Used in geometry since at least the 1600s to describe regular polygons.
A square is equangular (all 90° angles) but not necessarily equilateral (all sides equal)—this distinction teaches mathematicians that 'equal' means different things in different contexts.
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