Isonona Triangles for 3D Printing
An isonona triangle is one of four isosceles triangles with two angles , , or . Each kind can be dissected into isonona triangles, all with equal legs. The term isonona is introduced in analogy with the term isohepta [1, p. 218].[more]
This Demonstration shows isonona triangle templates for 3D printing.[less]
 G. N. Frederickson, Dissections: Plane & Fancy, New York: Cambridge University Press, 1997 p. 218.