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The rule is that for any polygon of sides number n,

The sum of interior angels equals (n-2) x 180 and each angel equal (n-2) x 180/n

Hence for a nona angel with number of sides equals nine,

The sum of interior angels = (9-2) x 180 = 7x180 =1260 degrees, and each angel = 1260/9 = 140 degrees

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11y ago

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