Question

when all the sides of triangle then how many line of geometry is possible

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Answer 1

Answer:

three possible lines

I think so

Answer 2

Answer:

For the triangle all of whose sides have length 3, a proper fold through any vertex can serve as a line of symmetry and so there are three possible lines. The triangle with side lengths 2,4,5 cannot have any lines of symmetry as the side lengths are all different.