What is a nonagram? A nine pointed star, perhaps. In any case, a general nonagram, like a general (ie non regular) polygram(!) has NO lines of symmetry.
5 sides
8 sides.
5 sides.
It has 1000 sides.
4 sides
three sides
Sides = faces. 6 of them.
A pentagon has 5 sides.
An hexagon has 6 sides.
a quadralateral has 4 sides
A octagon has 8 sides.