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If its a regular 8 sided octagon then each interior angle is 135 degrees
135
An octagon has 8 sides whereas an hexagon has 6 sides
Any value you like - between 0 and 360 degrees. The size of an individual angle can only be determined if the octagon is regular but you cannot assume that it is.
Do you mean sides? That's 8. If you mean sizes, as you spelled it, then a given octagon has only one size, but the shape generally referred to as an "octagon" can have an infinite number of sizes.