The 4 interior angles add up to 360 degrees
Triangles have 3 interior angles that measure 180 degrees total.
(number of sides - 2)*180 = total sum of interior angles
The interior angles measure 360 degrees.
Interior angles total 2520 degrees
The interior angles of an octagon add up to 1080 degrees 1080 degrees in total, 135 each.
Interior angles = 360 degrees Exterior angles = 360 degrees
Exterior angles 360 degrees Interior angles 1260 degrees
Sadly, there is no such shape. There is a heptagon or an octagon but a hectogon simply does not exist. And, since it does not exist, it has no interior angles. And since there are no interior angles, there is no total measure for them. I suggest you check out a mathematical site or a dictionary and figure out what you want and re-post the corrected question.
what is the total of interior angles of the nonagon
No because the total sum of interior angles of a parallelogram are 360 degrees.
the total interior angles in a trapezium is 360 degrees!