Find the resistance between point A and B

Question

a) A figure made of wire consists of two equilateral triangles of triangles as shown in fig. a). The length of the side of the larger triangle is a, the longitudinal resistance of the wire is ρ. Find the resistance between points A and B.

b) In case b), only the number of triangles is infinitely big. Find the resistance between points A and B.

Answer 1

Please take a look at the answer I posted in the link below:

https://www.mathcha.io/editor/eWq2diEXSj3CJBxJ7dC69dx7Iv4nNqkuGZ7Zol