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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360
yes
It depends on the actual shape of that octagon. It CAN have two pairs of parallel sides. A regular octagon has 4 pairs of parallel sides.
They add up to 360 degrees
Not at all. One way to make it would be to cut the corners off a square.