noun
Euclidean geometry
Mathematics term for the classical geometry based on Euclid's axioms.
ユークリッド幾何学では、平行線は交わらない。
In Euclidean geometry, parallel lines do not intersect.
Non-Euclidean geometry, which rejects Euclid's parallel postulate.
From ユークリッド (Euclid) + 幾何学 (geometry).