1/9 x 360 = 40
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Degrees are used to measure the arc of a circle. A full circle is 360 degrees, and a half circle 180. so 9 degrees would be 1/40th of a complete circle.
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If it's a regular 9 sided polygon then each interior angle will measure 140 degrees.
It is a 9 sided nonagon and its 9 interior angles add up to 1260 degrees
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