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180(9-2) =180 degrees x 7 = 1260

actually, that is for a nine... angled thingy...

the sum of a nonagon's interior angles would be

180(n-2)= whatever the answer is.

put in however many-agon it is for 'n'.

for example...

a triangle.

180(3-2)= 180(1)= 180

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