Eight - that is why it is called an octagon.
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The sum of all the interior angles of a regular octagon is 360 degrees.
The exterior angles of an octagon total 360 degrees.
The interior angles of an octagon add up to 1080 degrees 1080 degrees in total, 135 each.
All of the angles in an octagon add up to 810 degreesIf you want to know what one of the angles equals you do 810 divided by 6 to get 135Another contributor's answer:An octagon is an eight sided polygon.Interior angles total 1080 degrees.Exterior angles total 360 degrees.
Whether or not a polygon is regular makes no difference to the number of sides or angles that it contains. An octagon has eight sides and eight angles.