You didn't specify 'out of what' so I will approach this from the point of view on how to determine the angles of the pieces. If it is a single board, the angles would be 45 degrees (360 deg. to a circle / 8 sides). Starting with a circle drawn with a compass or trammel points would help with accuracy when laying out. If it is to be made of straight parts, 8 pieces would have angles of 22.5 degrees on each end. When put together, each pair will form a 45 deg. angle. In order to not be lop-sided, each piece must be exactly the same length.
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You might be able to construct an irregular octagon that way, but for a regular one, no.
a regular octagon has the same length all sides. so with the given angle draw 8 sides at an angle of 135 degrees from each other
An octagon has 8 angles.An octagon has 8 angles.An octagon has 8 angles.An octagon has 8 angles.
an octagon...
No, but an octagon is.