Isonona Triangles

An isonona triangle is one of the following four isosceles triangles: a triangle with two equal angles of , , or . Each can be dissected into similar isonona triangles, all with equal legs. The term isonona is introduced in analogy with the term isohepta [1, p. 218].
This Demonstration shows isonona triangles and their expansions and dissections.

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Reference
[1] G. N. Frederickson, Dissections: Plane & Fancy, New York: Cambridge University Press, 1997 p. 218.
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