Any angle that you like. The only limitation on any single angle of an octagon is that it lies between 0 and 360 degrees..
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which to has a larger interior angle, octagon or hexagon?
In an octagon, the sum of all exterior angles is always 360 degrees. Therefore, each exterior angle of an octagon measures 360 degrees divided by 8, which equals 45 degrees. This means that each exterior angle of an octagon is 45 degrees.
Providing that it is a regular octagon: Exterior angle: 45 degrees Interior angle: 135 degrees
the sum of the angle in a octagon is 1080
For a regular octagon it is 1080