弧|こko[1]atamadaka (head-high)

1. nounarc
   要素ようそＣとＤは弧この生成せいせいには無関係むかんけいなので排除はいじょすることができる。↗

   We can eliminate C and D since they are irrelevant to the generation of the arcs.

• Synonym円弧えんこWrittenWritten/formal prose. A mathematical term for a segment of a circle's circumference. 「弧」 is broader, also covering arc shapes such as parabolas.
• RelatedアークNeutralLoanword. Means arc, but also the electric arc, as in 「アーク溶接」. 「弧」 is the term used in mathematics and geometry.
• Related弧線こせんWrittenWritten/formal prose. A curve forming part of a circle; used less often than 「弧」, which also covers arc shapes such as parabolas.
• Antonym直線ちょくせんNeutralNeutral. A straight line, contrasting with the curve of 「弧」.

In geometry, say 「弧」 or 「円弧」; to draw an arc, say 「弧を描く」. Use 「アーク」 for electric arcs, as in 「アーク溶接」, and 「直線」 for a straight line.

Usage comparisons are AI-assisted and cross-checked by multiple models; for study reference only

1. 円周えんしゅうの一部いちぶ。また放物線ほうぶつせんの一部いちぶなど、円周えんしゅうの一部いちぶに似にた線せん。数学すうがくでは円周えんしゅうの連続れんぞくする一部分いちぶぶんのみを指さす。