劣れっ弧こ

noun

minor arc

Technical geometry term for the shorter of the two arcs connecting two points on a circle. The opposite is 優弧 (ゆうこ, major arc).

• 円えん周しゅう上じょうの二に点てんを結むすぶ劣れっ弧この長ながさを求もとめよ。

  Find the length of the minor arc connecting two points on the circumference.