A pentagon is a 5 sided polygon whose interior angles add up to 540 degrees
An octagon has interior angles of 1080 degrees.
It is a regular 5 sided pentagon
Right angle not polygon. (i'm not mad).
The name of a 12 sided polygon is dodecagon.
octagon
A regular hexagon.
Providing that it is a regular polygon then it is a nonagon which has 9 sides
an Octagon, because 360/8=45.
It will have 21 sides or a 21-gon
That would depend on what A sided polygon it is.
Since a three sided polygon is another name for a triangle. We would use the formula of * (n - 2)180 = degrees of the polygon * n = number of sides of the polygon * (3(sides) - 2)180 * (1)180) * = 180o
In Geometry that are many different types of polygons. The polygon whose angles equal up to 180 degrees is a triangle.