140 degrees.
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140
Each angle for a regular nonagon is 140 degrees each.
Each exterior angle: 40 degrees Each interior angle: 140 degrees
because there are to many sides * * * * * Each interior angle of a regular nonagon is 140 degrees. At any point in the tessellated plane, a whole number of shapes must come together and the sum of their interior angles must be 360 degrees. 140 does not go into 360 and so a regular nonagon cannot tessellate.