凸とつ多た角かく形けい

noun

convex polygon

Technical term in geometry; all interior angles are less than 180 degrees.

See also: 凹多角形

• 正せい五ご角かく形けいは凸とつ多た角かく形けいの一いっ種しゅです。

  A regular pentagon is a type of convex polygon.