yes
No, a regular octagon has 8 congruent sides
No. It is the opposite sides of a regular octagon that are parallel and congruent.
YES it is.
No, they do not.
8 if it's a regular octagon
An octagon can have congruent angles if it is regular, meaning all its sides and angles are equal. In a regular octagon, all eight internal angles are congruent, each measuring 135 degrees. However, an irregular octagon may have varying angles, so the number of congruent angles can differ. In summary, a regular octagon has eight congruent angles, while an irregular one may have fewer or none.
Eight
yes
8
Yes, they all are congruent and have 4 lines of symmetry
4
There are 6 of them.