Plural of geometry; multiple systems or types of mathematics dealing with shapes, sizes, and spatial relationships, or multiple geometric arrangements.
Plural of 'geometry' from Greek 'geometria,' meaning 'measuring the earth,' from 'geo-' (earth) and '-metria' (measuring). The plural allows discussion of different geometric systems.
Mathematicians discovered non-Euclidean geometries in the 1800s where parallel lines meet and triangles don't add up to 180°—these became essential for Einstein's theory of relativity!
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