Have a look around you?
All isosceles triangles are not equilateral triangles
18 triangles can be found in a 20-agon
All isosceles triangles are not equilateral triangles
No
Yes.
8
No...
true
your mom is the right triangles
there are 9
Six equilateral triangles are found in a regular 6 sided hexagon
Some triangles can be classified by only term, and some triangles fall into two overlapping, non-mutually-exclusive categories.