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An isopenta triangle is one of the two isosceles triangles: a triangle with two angles or a triangle with two angles . Either can be dissected into similar isopenta triangles all of equal legs.[more]
This Demonstration shows isopenta triangles and their expansions or dissections.[less]
Contributed by: Izidor Hafner (August 2020)
Open content licensed under CC BY-NC-SA
 G. N. Frederickson, Dissections: Plane & Fancy, New York: Cambridge University Press, 1997 p. 212.