9
It has 9 sides
1260 degrees
A regular octagon has 8 sides.
a regular pentagon has five sides. The word regular means equal
A regular heptagon has seven sides.
A regular heptagon has no parallel sides.
a regular or scalene triangle has no equal sides
A regular decagon has 10 equal sides.
It can have 3, 4 or 6 sides.
A regular or an irregular dodecagon both have 12 sides
9 sides
it has twelve sides