1080o
1260o
1800o
2160o
Correct answer is B
Each interior angle = 140
(n−2)×180n=140
(n - 2) x 180 = 140n
150 - 360 = 140n
180m - 140n = 360
40n - 360
n = 36040
n = 9
Sum of all interior angles = (n - 2) x 180
= (9 - 2) x 180
= 7 x 180
= 1260
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