A. S. Besicovitch, On Arcs That Cannot Be Covered by an Open Equilateral Triangle of Side 1, The Mathematical Gazette, Vol. 49, No. 369 (Oct., 1965), pp. 286-288 ...

Trihexaflexagon is constructed by cutting a strip of paper so that it may be marked off in 10 equilateral triangles (A). The strip is folded backward along the line ab and turned over (B).

Draw geometrically accurate triangles in React Native Supports equilateral, isosceles, scalene & right-angled triangles Built on top of the inbuilt <View/> component ...