A convex polygon, including an octagon, is a 2d shape such that any straight line joining any two points on its boundary lies wholly within the shape. This is assured if each of its interior angles is less than 180 degrees.
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The measure of the exterior angle of a convex octagon is indeterminate.
Its 8 exterior angles add up to 360 degrees
a polygon is convex
A non convex is a concave and a convex is differently shaped
An octagon has 8 angles.An octagon has 8 angles.An octagon has 8 angles.An octagon has 8 angles.