Since it is not a regular octagon, any value that you like.
If it is a regular 8 sided octagon then each exterior angle is 45 degrees and each interior angle is 135 degrees.
Each angle of a rectangle measures 90 degrees.
Each angle for a regular nonagon is 140 degrees each.
The 8 interior angles of an octagon add up to 1080 degrees
135 degrees
Each exterior angle = 630/6 = 60 degrees. So each interior angle = 180 - 60 = 120 degrees.
Each exterior angle is 360/8 = 45 degrees. So each interior angle is 180 - 45 = 135 degrees.
Each interior angle of a regular 6 sided hexagon is 120 degrees.
60 degrees in each angle
A right angle - whether or not in a rectangle - is 90 degrees.
Total is 17640 degrees Each angle is 176.4 degrees.
There are 1260 degrees, with each angle measuring 140 degrees.