always
No. Two regular hexagons are always similar to each other, but two random hexagons are not necessarily similar.
Their interior and exterior angles are always the same but their perimeters may vary in length. But that is what "similar" means; so the answer is YES.
No, one regular hexagon could be larger than another regular hexagon.
Not always, sometimes two obtuse triangles are similar and sometimes they are not similar.
Sometimes similar but it depends
sometimes
No. Two regular hexagons are always similar to each other, but two random hexagons are not necessarily similar.
Their interior and exterior angles are always the same but their perimeters may vary in length. But that is what "similar" means; so the answer is YES.
yes
No, one regular hexagon could be larger than another regular hexagon.
It's possible but usually not. But any two regularones are definitely always similar.
No. They're always in the same ratio.
No. They are proportional, meaning that if side A of one hexagon is, for example, twice the corresponding side A' of the other hexagon, then side B will also be twice the size of side B', etc.
If they have the same nuber of sides (angles) then always. If not then never. So, overall, I suppose the answer is sometimes - depending on the number of sides.
Congruent figures are always similar. However, similar figures are only sometimes congruent.
Two regular octagons are always similar because they have equal angles and all sides are congruent. This means that they have the same shape, just different sizes.
Not always, sometimes two obtuse triangles are similar and sometimes they are not similar.