# 9-gon

Sum of interiol angles of 9-gon is:

s =  1260 °

### Step-by-step explanation:

$s=180\cdot \left(9-2\right)=1260\text{°}$ Did you find an error or inaccuracy? Feel free to write us. Thank you! #### You need to know the following knowledge to solve this word math problem:

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