the answer would be 2
There are 35 diagonals inside a decagon
7
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.
4 (1 horizontal: left to right, 1 vertical: up and down and 2 diagonal)
Four.
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
it has 4 :)