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
A pentadecagon, which has 15 sides, can be analyzed for parallel lines by considering the sides. Each pair of opposite sides in a regular pentadecagon can be seen as parallel. Since there are 15 sides, the number of pairs of parallel sides is given by the formula ( \frac{n}{2} ) where ( n ) is the number of sides. Therefore, a regular pentadecagon has 7 pairs of parallel lines.
A Pentadecagon had 15 sides
9 diagonals
Two.Two.Two.Two.
None
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.
Diagonal lines are used for many things like art and designs. They can be used for buildings.
zero
it has 4 :)
4
14
14.
A Pentadecagon had 15 sides
the answer would be 2
neff
2