parallel
No because a nonagon which is a 9 sided shape has 27 diagonals
9 diagonals
None
Two.Two.Two.Two.
it depends on what you mean by a diagonal. If you take a diagonal to mean a line from one corner to the "opposite" corner, then a nonagon doesn't have any, and a decagon has five. The reason a nonagon doesn't have any, is that the corners aren't opposite each other.
In a regular nonagon no two sides are parallel.
A 9 sided nonagon normally has no perpendicular lines that meet at right angles
parallel
A heptagon has 4 diagonal lines and 7 sides and it has 2 congruent diagonal lines and 2 congruent triangles
There are four diagonal lines in a hexagon.
No because a nonagon which is a 9 sided shape has 27 diagonals
In general, none, but there can be nine.
Not many. Depending on how you write, the letters L, O, Q, and X can have diagonal lines of symmetry.
Diagonal lines are used for many things like art and designs. They can be used for buildings.
4
zero