It is a nonagon which is a polygon that has 9 sides
A polygon with nine vertices also has nine sides, and is therefore a "nonagon".
They have nine sides, and nine internal angles.
A nonagon has nine sides, nine angles and nine corners (vertices).
A figure or polygon having nine sides and nine angles.
A 9-gon is a polygon with nine sides and nine angles
do you mean Nonagon. It is a nine sided polygon, edges and vertices - 9, internal angles 140o
It is: 40 degrees
1,260 Complete this formula 180(n-2) n is for the number of sides in the polygon.
The sum of the exterior angles of any polygon - however many sides it has and whether it is convex or concave - is always 360 degrees.
Such a polygon is said to be a "regular" polygon, meaning that all its sides are equal and all its angles are equal, so we have; equilateral triangle; square; pentagon; hexagon; heptagon;octagon;nonagon;decagon - to give but the first nine possibilities. The next one would have 11 equal sides and angles, and I don't know its name.
Nine
7 It is not possible for a regular polygon to have exterior angles of 180 degrees or less in plane geometry