90.
Number of diagonals = number_of_sides × (number_of_sides - 3) ÷ 2
→ For a Pentadecagon which has 15 sides:
Number of diagonals = 15 × (15 - 3) ÷2 = 15 × 12 ÷ 2 = 90
16
A Pentadecagon had 15 sides
None
Two.Two.Two.Two.
9 diagonals
How many diagonal lines does a 1million sided shape have
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.
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.
zero
it has 4 :)
14
4
14.
A Pentadecagon had 15 sides
the answer would be 2
neff