Please help. What is the SUM of the angle measures in a nonagon (9 sides)?1080°1260°1440°900°

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21 votes

The sum of angles in a polygon is given as

Where the number of sides is n

Since n=9, this gives

$\begin{gathered} (9-2)*180 \\ =7*180 \\ =1260^0 \end{gathered}$

The sum of the angle of measures in a nonagon is 1260 degrees

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