Dissecting One Isonona Triangle into Two
An isonona triangle is one of the following four kinds of isosceles triangles: a triangle with two equal angles of , , or . Each can be dissected into isosceles isonona triangles.[more]
This Demonstration shows a dissection of one isonona triangle into a triangle with two angles into a triangle with two angles and a triangle with two angles .[less]
The term isonona is introduced in the same way as the term isohepta [1, p. 218].
 G. N. Frederickson, Dissections: Plane & Fancy, New York: Cambridge University Press, 1997 p. 218.