Kokotsakis polyhedron
A Kokotsakis polyhedron is a polyhedral surface in three-dimensional space consisting of any polygon as its base and quadrilaterals alternating with triangles as its lateral faces; for an n {\displaystyle n} -sided polygonal base, there are n {\displaystyle n} quadrilaterals and n {\displaystyle n} triangles. == Properties and history == The polyhedron was discovered when Kokotsakis (1933) studied the meshes wherein the perimeter of a polygon is surrounded by other polygons, showing an infinitesimally flexible in the case of a quadrilateral base, which was later known as Kokotsakis mesh.