SOLUTION: What is the measure of an interior angle of a regular 9-gon?

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Question 270447: What is the measure of an interior angle of a regular 9-gon?
Answer by stanbon(75887) About Me  (Show Source):
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What is the measure of an interior angle of a regular 9-gon?
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Fact: The sum of the exterior angles is 360 degrees.
In a 9-gon each exterior angle is 360/9 = 40 degrees
Each corresponding interior angle is 180-40 = 140 degrees
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Cheers,
Stan H.