They have nine sides, and nine internal angles.
it has 9 sides,9 angles and 9 vertices
Nonagons have 9 sides
All nine sided polygons are known as "nonagons". Nonagons that have all side lengths the same are known as "regular nonagons".
Nonagons are in the most extraordinary forms. There can be a nonagon- shaped booger!
enneagons or nonagons
They are nonagons
A hexagon has six sides, and a nonagon has nine. Three hexagons and three nonagons then have (3 x 6) + (3 x 9) = 18 + 27 = 45 sides altogether.
It may, or it may not, be symmetrical. There are different types of nonagons.
9 of them, as well as 9 angles.