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Method 1: Interior angles of regular n-sided polygon are ((2n - 4) x 90)/n degrees

When n = 9 this works out at 140 degrees.

Method 2: Exterior angles of regular n-sided polygon are 360/n degrees in this case 40 degrees, making interior angles 180 - 40 ie 140 degrees.

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Q: What is the measure of one angle regular polygon with 9 sides?
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