円弧(えんこ)

えんこ
noun
arc; circular arc
science
1. arc; circular arc
A portion of the circumference of a circle. Used in mathematics, engineering, and design to describe curved segments.
円弧(えんこ)を描(えが)く。
To draw an arc.
虹(にじ)は大(おお)きな円弧(えんこ)の形(かたち)をしている。
A rainbow has the shape of a large arc.
コンパスを使(つか)って半径(はんけい)五(ご)センチの円弧(えんこ)を引(ひ)きなさい。
Use a compass to draw an arc with a radius of five centimeters.

Composed of 円(えん) (circle) and 弧(こ) (arc). A mathematical and technical term for a segment of a circle's circumference. Also used more loosely to describe any curved, arc-like shape.

Common collocations

Similar words

  • 弧(こ): arc — the character alone, used in mathematics
  • アーチ: arch — loanword; refers to architectural arches
  • 曲線(きょくせん): curve — a more general term for any curved line
  • 弧(こ)度(ど): radian — the angular measure based on arc length

Related Words

Compare: 曲線(きょくせん) (curve)
general
Added 2026.4.9 6:26 · Revised 2026.9.9 0:22
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