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One angle of a heptagon is 126 degree and each of the other six angles is x degree.find x.(please do it step-by step otherwise i can't understand)
sum of angles of a heptagon=(n-2)×180=(7-2)×180
                                             =5×180
                                             =900
Given one angle is 126 and each of the other six angle is x.
ie.,126 + 6x =  900
6x = 900 -126
6x = 774
x = 774/6
x = 129


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