its an Octagon
A regular decagon
triangel
It is usually a regular polygon that has equal sides.
No. Except that in a REGULAR polygon, all the sides must be of the same length and all the angles of the same measure.
There is no special name for that. However, if the sides are also equal, it is called a regular polygon.
A regular polygon
A regular hexagon.
A regular decagon
That is called a regular polygon.
infinitagon
A polygon with eight sides, regular or not, is an octagon. There isn't a special name for a regular octagon (other than "regular octagon").
It is not possible to name each polygon since there are infinitely many of them. There is no relationship between whether a polygon is regular and the number of sides or angles that it has. So, there is no way to determine, from its name, if a polygon is regular.
That is called a regular polygon.
triangel
It is usually a regular polygon that has equal sides.
If a polygon's sides are all of equal length, it is known as a regular polygon. (The measure of each of its angles will be the same as well)
pentagon