Any angle that you like. There are no constraints on a single angle of a decagon, only on their sum.
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90 degree angle is the measure of each piece. Once the angles are formed at 145 degrees, each corner makes a 90 degree angle.
35 degrees
35 degrees
There is too much extra needed information before an answer can be given. Is the wood to make only the circumference, or would it make all the surface, what is the width of the wood, what design to make the octagon.
wood is not a proper noun