Dissection of a Spherical Equilateral Triangle into Three Isosceles Triangles
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This Demonstration shows a dissection of a spherical equilateral triangle into three congruent spherical isosceles triangles.
Contributed by: Izidor Hafner (March 2017)
Open content licensed under CC BY-NC-SA
An analogous construction in the plane gives three equilateral triangles.
 G. N. Frederickson, Dissections: Plane & Fancy, New York: Cambridge University Press, 2002 p. 43.