Plural form of diagonal; lines or segments connecting non-adjacent corners or vertices of a polygon or polyhedron.
From Greek dia- (through) + gonia (angle), literally 'through angles.' The plural form adds the standard -s suffix to the singular diagonal.
A square has two diagonals, but a pentagon has five—and the more corners a shape has, the dramatically more diagonals it sprouts. This is why architects love diagonals: they're structurally stronger and create visual movement that your eye finds satisfying.
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