凹おう多た角かく形けい

noun

concave polygon; non-convex polygon

Technical geometry term for a polygon with at least one interior angle greater than 180 degrees. Contrasts with 凸多角形 (convex polygon).

See also: 凸多角形

• 凹おう多た角かく形けいは少すくなくとも一ひとつの内ない角かくが180度どを超こえる。

  A concave polygon has at least one interior angle exceeding 180 degrees.