It depends on the quadrilateral. The max number is 4, but the min is 0.
yes
0 is symmetrical because when something is symmetrical it can be split down the middle and have two symmetrical sides or two sides that look the same. If you draw your ones like a straight line then it could be symmetrical depending on your teacher. If your teacher allows you to make your symmetrical lines going horizontal instead of vertical then 3 would also be symmetrical. F.Y.I if you don't trust a enrichment middle schooler who has learned this recently then don't use this information
no
No
8 has vertical symmetry.
Yes.
yes
yes it is
yes it is
Yes. Regular polygons with an odd number of sides are also symmetrical.
A symmetrical number is one that reads the same from either direction, e.g. 121, or 1345431