幾 何 学(きかがく)

きかがく

noun

geometry

1. geometry

The branch of mathematics dealing with shapes, sizes, positions, and properties of space. Also used in compound forms to describe geometric patterns and designs.

幾何学(きかがく)の授業(じゅぎょう)で三角形(さんかくけい)の面積(めんせき)を習(なら)った。

I learned the area of triangles in geometry class.

イスラム美術(びじゅつ)は幾何学(きかがく)模様(もよう)が美(うつく)しい。

Islamic art has beautiful geometric patterns.

古代(こだい)ギリシャの数学者(すうがくしゃ)たちは幾何学(きかがく)の基礎(きそ)を築(きず)いた。

Ancient Greek mathematicians built the foundations of geometry.

Usage

Used in both academic and everyday contexts. The adjective form 幾何学的(きかがくてき) (geometric) is common for describing patterns and shapes.

Common collocations

幾何学(きかがく)模様(もよう) (geometric pattern)
幾何学的(きかがくてき)な (geometric — adjective)
平面(へいめん)幾何学(きかがく) (plane geometry)
立体(りったい)幾何学(きかがく) (solid geometry)

Etymology

幾何(きか) is Chinese for "how much". It entered the field through the 1607 Chinese translation of Euclid, 幾何原本(きかげんぽん). A popular explanation says it also echoes the sound of "geo-" in "geometria", but that is disputed.

general

Added 2026.3.15 11:18 · Revised 2026.10.13 21:43

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