I am going to assume that you mean a regular octagon.
If you use the formula 180(n-2), where n=the number of sides, plug in 8 for an octagon and you get 1080 as the sum of the interior angles. Now divide this by 8 in order to get the measure of one of the interior angles, which turns out to be 135.
Now, if you are looking for the exterior angle measurement, then simply subtract 135 from 180 to get 45.
45 is your exterior angle measurement, 135 is your interior angle measurement.
135 Each interior angle of a regular octagon measures 135 degrees.
For a regular octagon it is 1080
1,080
135
Providing that it is a regular octagon each interior angle measures 135 degrees
The exterior angle of an octagon measures 45 degrees. In geometry, this belongs to the group of polygons which are composed of many sides and angles.
Providing that it is a regular octagon each exterior angle measures 45 degrees.
135 Each interior angle of a regular octagon measures 135 degrees.
Each interior angle of a regular 8 sided octagon measures 135 degrees
45 degrees
360 degrees
Each interior angle of a regular 8 sided octagon measures 135 degrees